卡露蓮·禾絲妮雅琪
卡洛琳·瓦芝妮雅琪（，），丹麥前職業網球選手。
她曾經登上單打世界排名第一長達67週，共先後三度登頂，並在2010年、2011年成為年終冠軍，使她成為北歐第一位單打排名第一的女子選手，至今贏得1座大滿貫金盃，丈夫是已退役籃球員大衛·李。2009年，年僅十九歲時闖進美國網球公開賽決賽，但輸給金·克萊斯特爾斯。瓦芝妮雅琪是少數擁有至少20座WTA單打冠軍的選手；她在2010年便拿下6座WTA單打冠軍，隔年再取得6座冠軍。瓦芝妮雅琪在雙打也拿過2座WTA冠軍。2018年澳洲網球公開賽，打敗時任世界第一的哈勒普，三度叩關大滿貫女單決賽，終於奪得生涯第一座大滿貫冠軍，並再次重回世界第一。
瓦芝妮雅琪的父母皆是出身自波蘭的天主教家庭，並且皆是運動員，父親是足球員，母親則是波蘭排球國手；由於父親簽約給丹麥的足球俱樂部，因此搬至丹麥居住。瓦芝妮雅琪便是出生在丹麥，並持丹麥國籍。哥哥是前職業足球員。
瓦芝妮雅琪能夠流利的使用英語、丹麥語和波蘭語。
瓦芝妮雅琪曾在受訪時表示，除了網球之外，她對於手球、足球、游泳、彈鋼琴等都很有興趣。她是英格蘭足球超級聯賽中利物浦足球俱樂部的球迷，她在2011年卡達女子公開賽中穿著有史蒂芬·傑拉德簽名的利物浦球衣上場。
根據富比士2011年公布的排行榜，瓦芝妮雅琪是該年收入第二高的女性運動員；同年六月運動雜誌SportsPro公布的最有商業市場的運動員排名，瓦芝妮雅琪名列第九。而富比世2013年公布的女性運動員收入排行榜，瓦芝妮雅琪以1360萬美元排名第七。2019年富比世統計收入最高的女運動員，瓦芝妮雅琪以年收入750萬美元，排名第6名。
2012年瓦芝妮雅琪發行了單曲《氧氣》(Oxygen)。
2013年12月31日她與交往2年的北愛爾蘭高爾夫球職業選手羅伊·麥克羅伊在推特上宣布訂婚，但二人於2014年5月分手。
2017年11月3日她與美國籃球職業選手大衛·李在推特上宣布訂婚。2人在2019年6月16日結婚，塞雷娜·威廉姆斯是她的伴娘。
2021年6月11日，瓦芝妮雅琪生下了女兒奧利維亞。
禾絲妮雅琪是典型的防禦型底線球員，擊球方面使用較多的上旋，擊球路徑弧形較高較大以確保絕對不會掛網，反拍強於正拍，反拍可打出較深落點的攻击球，正拍則以穩定為主。因移位迅速、體力也好，能救回許多看似制勝的快速球，被暱稱為「瓦牆」，她也常常參加馬拉松，並能以3小時多的成績完賽。但她由於偏向保守穩定，即便有攻擊機會，若有些冒險的可能，便不會嘗試攻擊，因此在比賽中欠缺掌握先發制人的機會，常常是把來球推回去，故在國外也有「"Push"niacki」的揶揄（意指「推球雅琪」），而如果遭遇攻擊連續且兇猛的對手，常會有「倒牆」的危機。
年初澳洲網球公開賽名列第四種子，這也是瓦芝妮雅琪第一次在大滿貫比賽中名列前八種子，但在第四輪遭到中國女將李娜以6-4, 6-3直落二盤淘汰，但也使她世界排名上升到第3名。
接下來她以第二種子參加印第安泉公開賽，瓦芝妮雅琪進入決賽但輸給了前世界第一的耶萊娜·揚科維奇，這使得她世界排名在上升到第2名；而邁阿密大師賽則在八強時輸給了甫復出的前世界第一賈斯汀·海寧。
在佛羅里達州舉辦的MPS集团锦标赛，她名列第一種子並成功進入決賽，並以6-2, 7-5直落二盤擊敗奧爾加·葛沃索娃奪得冠軍，這是她該年度第一座WTA單打冠軍。接下來的家庭圈盃網賽則在四強面對薇拉·兹沃纳列娃時因受傷被迫中途退賽。
雖然受傷未癒，她仍參加紅土賽季的比賽，接連在保時捷、羅馬和馬德里提前出局後，她闖進華沙公開賽八強，但仍在比賽中間因傷退賽。
法網她則名列第三種子，並進入八強，但遭到最後的冠軍弗蘭切斯卡·斯基亞沃內以6-2, 6-3直落二盤淘汰。雙打部分她則與達妮埃拉·漢圖霍娃搭檔，但在第二輪面對威廉絲姐妹前就因漢圖霍娃右肩受傷而退賽。
在草地賽季，她以衛冕冠軍身分參加伊斯特本，但提前輸給了阿拉瓦內·雷扎伊。瓦芝妮雅琪以第三種子身分參加溫網，但在第四輪遭到同屬新生代的選手佩特拉·克維托娃以6-2, 6-0直落二盤橫掃淘汰。
而在首度舉辦的丹麥公開賽則名列第一種子，該比賽的創立很大一部分便是由於瓦芝妮雅琪在國內的知名度，她在決賽擊敗克拉拉·扎科帕洛娃，拿下該年第二座WTA冠軍。
在辛辛那提公開賽則在第三輪輸給了瑪麗昂·巴托莉；而在蒙特婁舉辦的羅傑斯杯則名列第二種子，她在準決賽面對斯維特拉娜·庫茲涅佐娃，但因為大雨被迫延後兩天，接下來在同一天內她擊敗庫茲涅佐娃並在決賽中擊敗薇拉·兹沃纳列娃，拿下該年度第三座WTA冠軍。而在纽黑文公开赛也衛冕成功，決賽以6-3, 3-6, 6-3擊敗娜迪亚·佩特洛娃，連續三個比賽接拿下冠軍。
因為世界排名第一的小威廉絲退賽，瓦芝妮雅琪得以在美國公開賽名列第一種子，在四強遭到薇拉·兹沃纳列娃以6-4, 6-3直落二盤淘汰。但也讓她和大威廉絲成為該年唯二在四大滿貫賽事至少打進第四輪的女子選手。
瓦芝妮雅琪在日本東京第二輪勝出後成為第一個獲得年終賽參賽資格的選手，她並在決賽擊敗耶莲娜·德门蒂耶娃獲得該年度第5座WTA冠軍。接下來的中國網球公開賽，她在第三輪打敗佩特拉·克維托娃後確定取代小威廉絲登上世界排名第一寶座，這也是第一位丹麥選手在職業網壇上登上世界第一；而後她在決賽擊敗薇拉·兹沃纳列娃贏得她該年度第6座WTA冠軍。
年底WTA巡回赛总决赛，瓦芝妮雅琪與弗蘭切斯卡·斯基亞沃內、薩曼莎·斯托瑟和耶蓮娜·德門蒂耶娃被分到同一組，第一天她以6-1,6-1擊敗德門蒂耶娃，但在第二天輸給了斯托瑟，不過在第三天她以3–6, 6–1, 6–1逆轉擊敗斯基亞沃內，除了得以晉級四強外，也已確定她取得足夠積分成為年終冠軍。四強時她以7-5,6-0擊敗薇拉·兹沃纳列娃，但在決賽以3-6,7-5,3-6輸給了金·克萊斯特爾斯。
本年度瓦芝妮雅琪第一個WTA賽事為雪梨國際賽，名列第一種子的她第一輪輪空，不過在第二輪就輸給多米尼卡·齊布爾科娃。而澳洲網球公開賽是瓦芝妮雅琪登上世界第一後第一個大滿貫賽事，她在四強賽時錯過一個賽末點後被李娜逆轉淘汰。
二月，前世界第一的金·克萊斯特爾斯在巴黎的室內賽八強擊敗杜琪克後確定擠下瓦芝妮雅琪重回世界第一寶座，不過在下一週剛降到第二名的瓦芝妮雅琪在杜拜網球錦標賽八強賽擊敗莎哈爾·皮爾後確定取得足夠積分重回世界第一寶座；隨後她在決賽擊敗斯維特拉娜·庫茲涅佐娃拿下生涯第十三座也是該年第一座WTA單打冠軍。
在杜哈，她未失一盤的連續擊敗娜迪亞·佩特羅娃、弗拉維婭·佩內塔和瑪麗昂·巴托莉，闖入決賽後輸給薇拉·兹沃纳列娃。
印第安泉公開賽瓦芝妮雅琪一路挺進決賽並擊敗瑪麗昂·巴托莉，贏得她生涯第十四座WTA單打冠軍。
隨後在邁阿密大師賽，瓦芝妮雅琪首輪輪空，但她在第四輪輸給了第22種子安德烈婭·佩特科維奇，該場比賽她一共有52個非受迫性失誤，在被問到是否疲累時她回答安排太多場比賽了。而在家庭圈盃網賽她則進入決賽並擊敗非種子的艾蓮娜·費絲蓮娜，贏得該年度第三座和生涯第十五座WTA單打冠軍。而保時捷她則進入決賽，這是她該年第五個決賽，但她直落二輸給了尤莉亞·戈格斯。
馬德里她在第三輪再度輸給尤莉亞·戈格斯；羅馬則在四強時輸給了最後的冠軍瑪麗亞·莎拉波娃。
接下來的布魯塞爾公開賽，她在四強時擊敗了去年的法網冠軍弗蘭切斯卡·斯基亞沃內，並在決賽擊敗第八種子彭帥取得生涯第十六座WTA單打冠軍，這也是她第一座紅土冠軍。瓦芝妮雅琪在法國網球公開賽名列第一種子，但在第三輪便輸給了第二十八種子達妮埃拉·漢圖霍娃。
在家鄉舉辦的丹麥公開賽，身兼衛冕冠軍和第一種子的瓦芝妮雅琪成功闖進決賽並擊敗露絲·莎法洛法，贏得該年第五座WTA單打冠軍。溫網她則未失一盤進入第四輪但輸給了第24種子多米尼卡·齊布爾科娃。
瓦芝妮雅琪在羅傑斯杯第二輪輸給了羅貝塔·文奇；辛辛那提公開賽則在第二輪輸給了世界排名76位的美國選手姬絲汀娜·麥海爾；接下來在纽黑文公开赛則在四強擊敗弗蘭切斯卡·斯基亞沃內，並在決賽擊敗持外卡的Petra Cetkovská，贏得她該年第六座WTA單打冠軍，打平她去年所創的紀錄。
名列頭號種子的瓦芝妮雅琪在美國公開賽第一輪擊敗西班牙選手Nuria Llagostera Vives、第二輪則擊敗荷蘭選手Arantxa Rus、第三輪則擊敗台灣裔美國選手金久慈，在第四輪則逆轉擊敗斯維特拉娜·庫茲涅佐娃，八強擊敗安德烈婭·佩特科維奇，但在四強時輸給小威廉絲。
瓦芝妮雅琪在東京第三輪輸給了卡婭·卡內皮；在北京八強時輸給了弗拉維婭·佩內塔，這是她2011年十二場八強比賽中唯一輸的一場。
而在2011年WTA巡迴賽總決賽，瓦芝妮雅琪以第一種子身分參賽，她在分組比賽中擊敗了阿格涅什卡·拉德萬斯卡，但接連輸給薇拉·兹沃纳列娃和後來的冠軍佩特拉·克維托娃因而無法晉級四強，但她仍然以世界排名第一結束2011年賽程，整年度除了一週讓位給金·克萊斯特爾斯之外都站穩第一名寶座，這也是她連續第二年成為年終冠軍。
瓦芝妮雅琪2012年度第一場WTA賽事是雪梨國際賽，她在八強時面對阿格涅什卡·拉德萬斯卡一度領先並率先進入決勝局，但最後慘遭逆轉。
澳洲網球公開賽第一種子的瓦芝妮雅琪未失一盤進入八強，但輸給衛冕冠軍金·克萊斯特爾斯，這也表示瓦芝妮雅琪丟掉世界第一的寶座，由新任澳網冠軍維多利亞·阿扎倫卡所取代。在杜哈，她在第二輪就輸給了露絲·莎法洛法。
瓦芝妮雅琪是杜拜和印第安泉的衛冕冠軍，但分別輸給尤莉亞·戈格斯和安娜·伊萬諾維奇。邁阿密大師賽則以直落二擊敗包括小威廉絲在內的選手闖進四強，但最後輸給第二種子瑪麗亞·莎拉波娃而無緣決賽。而後在家鄉哥本哈根的比賽則一路闖進決賽但輸給安赫利奎·克柏，終止連兩年在該比賽奪冠的紀錄。
法國公開賽則在第三輪決戰三盤後輸給了卡婭·卡內皮。溫布頓則在首輪就輸給了達美拉·柏絲克，這是她職業生涯在2007年法國網球公開賽登場後首次在大滿貫賽中首輪出局。
瓦芝妮雅琪代表丹麥參加倫敦奧運，前三輪分別擊敗Anne Keothavong、雅尼婭·維克梅耶爾和達妮埃拉·漢圖霍娃闖進八強，但最後輸給最終冠軍小威廉絲。
接下來的羅傑斯杯則在四強時輸給了佩特拉·克維托娃；辛辛那提則在第三輪輸給了安娜斯塔西亞·帕夫柳琴科娃；已經連續四年拿到冠軍的纽黑文公开赛則在四強與瑪麗亞·姬莉蘭歌對戰前就因為八強賽與多米尼卡·齊布爾科娃比賽時傷到右膝而退賽。
右膝仍未傷癒的瓦芝妮雅琪在美國公開賽列名第八種子，但她在首輪就輸給了世界排名96位的羅馬尼亞選手Irina-Camelia Begu，這使得她世界排名掉到第十名，為三年來最低。
瓦芝妮雅琪接下來在首爾舉辦的韓國公開賽決賽以6-1, 6-0擊敗卡婭·卡內皮，拿下她2012年第一座WTA單打冠軍，同時也是生涯第十九座；在東京則接連擊敗Bojana Jovanovski、達妮埃拉·漢圖霍娃和李娜，但在八強賽輸給了阿格涅什卡·拉德萬斯卡；而在北京則打敗Chanelle Scheepers和謝淑薇，但在第三輪就輸給了安赫利奎·克柏。
接下來她以第三種子身分參加在莫斯科舉辦的克林姆林盃，她一路闖進決賽，並激戰三盤後成功擊敗第一種子薩曼莎·斯托瑟，拿下該年第二座WTA單打冠軍，同時也是生涯第20座，是現役選手中唯四WTA單打冠軍達到20座者。（另三位是大威廉絲、小威廉絲和莎拉波娃。）
最後在保加利亞舉辦的小年終賽，名列第一種子的瓦芝妮雅琪在決賽輸給了娜迪亞·佩特羅娃，只獲亞軍。瓦芝妮雅琪2012年從最初的排名第一位，最終以第10名結束全年賽程。
瓦芝妮雅琪在該年的第一場比賽為布里斯本國際賽，並列名第8種子，但在第一輪便以三盤輸給了資格賽選手Ksenia Pervak；隨後的雪梨國際賽，她打敗厄蘇拉·拉德萬斯卡後在第二輪就輸給了斯維特拉娜·庫茲涅佐娃。接下來的2014年澳洲網球公開賽，瓦芝妮雅琪打敗薩比娜·利斯基、Donna Vekić、Lesia Tsurenko進入第四輪，但再一次輸給斯維特拉娜·庫茲涅佐娃。
杜哈，瓦芝妮雅琪在八強時輸給阿格涅什卡·拉德萬斯卡；在杜拜則打敗露絲·莎法洛法、鄭潔、瑪麗昂·巴托莉進入四強，接下來則輸給最終冠軍佩特拉·克維托娃。馬來西亞公開賽首輪就輸給王薔。
印地安泉大師賽則擊敗阿莉澤·科爾內、艾蓮娜·費絲蓮娜、娜迪亞·佩特羅娃，並因八強對手維多利亞·阿扎倫卡傷退而晉級四強，她隨後打敗安赫利奎·柯貝闖進該年第一個決賽，這也是她四年內三度打進該巡迴賽的決賽，她最後輸給了瑪麗亞·莎拉波娃。邁阿密大師賽則在第三輪輸給了加碧妮·蒙奎露薩。
接著紅土賽季，瓦芝妮雅琪在家庭圈盃網賽的八強輸給史蒂芬妮·沃格勒；瓦芝妮雅琪之後一連在四個巡迴賽中首輪出局，分別是在斯圖加特輸給卡拉·蘇亞雷斯·納凡諾、馬德里大師賽輸給雅羅斯拉娃·施韋多娃、羅馬大師賽輸給Bojana Jovanovski、布魯塞爾公開賽輸給鄭潔。瓦芝妮雅琪在2013年法國網球公開賽名列第10種子，她於首輪打敗勞拉·羅伯森，第二輪再度輸給了Bojana Jovanovski。
她在草地的第一場比賽是伊斯特本，她接連擊敗達美拉·柏絲克、勞拉·羅伯森和葉卡捷琳娜·馬卡洛娃進入四強，但最後輸給了資格賽選手潔美·漢普頓。2013年溫布頓網球錦標賽，第9種子的瓦芝妮雅琪在第二輪就摔倒負傷輸給了捷克選手Petra Cetkovská，在該天比賽中同樣因滑倒和受傷輸掉比賽或退賽的頂尖選手包括若-威尔弗里德·特松加、維多利亞·阿扎倫卡、瑪麗亞·莎拉波娃，再次引起輿論對於溫布頓場地太容易滑倒的質疑。
瓦芝妮雅琪的表現接下來仍沒有好轉，在羅傑斯杯，她在第二輪面對索拉納·克斯蒂時即使於第二盤時擁有兩個賽末點，最後仍遭到逆轉淘汰；辛辛那提大師賽則擊敗彭帥、莫妮卡·尼古列斯庫、佩特拉·克維托娃進入八強，但輸給維多利亞·阿扎倫卡，這是2009年以來瓦芝妮雅琪首次輸給阿札倫卡。纽黑文公开赛則在四強輸給西莫娜·哈勒普。2013年美國網球公開賽，名列第6種子的瓦芝妮雅琪在前兩輪擊敗段瑩瑩和Chanelle Scheepers，不過在第三輪就輸給了從資格賽打進會內的卡美娜·格奧爾基，這也表示瓦芝妮雅琪自2008年以來，首次沒有在任何一個大滿貫賽中至少打進八強。
在亞洲賽事，瓦芝妮雅琪在東京擊敗弗拉維婭·佩內塔、瑪格達蓮娜·里巴里科娃和露絲·莎法洛法後進入四強，但輸給安赫利奎·柯貝；北京則因東京四強而首輪輪空，她擊敗莫妮卡·尼古列斯庫和斯洛恩·史蒂芬斯，在八強時輸給了當時世界排名第一且為最終冠軍的小威廉絲。
瓦芝妮雅琪在2013年最後一個賽事為布魯塞爾公開賽，名列頭號種子的瓦芝妮雅琪在八強激戰三盤擊敗了Bojana Jovanovski，也終止了對戰二連敗，她接下來擊敗溫網亞軍薩比娜·利斯基進入決賽，最後以直落二擊敗Annika Beck贏得她該年第一座WTA單打冠軍。雖然贏得冠軍，但瓦芝妮雅琪並未取得在伊斯坦堡舉辦的2013年WTA巡迴賽錦標賽資格，因為安赫利奎·柯貝也在林茲奪冠；雖然瓦芝妮雅琪可以參加在保加利亞索菲亞舉辦的WTA冠軍錦標賽，但她放棄了並飛往伊斯坦堡擔任候補第一位。瓦芝妮雅琪最後便以排名第10名結束2013年賽季。
在賽季之前，瓦芝妮雅琪將她的球拍從優乃克改換成法國品牌Babolat。原本她預計要參加的第一場巡迴賽為布里斯本國際賽，但她因右肩受傷未參加；她正式參加的第一場巡迴賽為雪梨國際賽，她在首輪擊敗尤莉亞·戈格斯，但在第二輪輸給露絲·莎法洛法。2014年澳洲網球公開賽，名列第十種子的瓦芝妮雅琪在第三輪激戰三盤輸給加碧妮·蒙奎露薩。
澳網之後，瓦芝妮雅琪在杜哈首輪輪空的情況下，第二輪輸給雅尼婭·維克梅耶爾；在杜拜則擊敗薩比娜·利斯基、Annika Beck、索拉納·克斯蒂，在四強則輸給最終冠軍大威廉絲。
印地安泉大師賽，去年為亞軍的瓦芝妮雅琪闖進了第四輪，但輸給了前世界第一耶萊娜·揚科維奇，被扣太多積分導致她世界排名跌到了第18名，是她2010年以來最低的排名。
邁阿密大師賽，她則闖進八強但輸給李娜；在墨西哥舉辦的蒙特雷公開賽是瓦芝妮雅琪首次參加的比賽，她擊敗可可·范德維奇、克里斯蒂娜·美拉德諾維奇、Karolína Plíšková後進入四強，但輸給最終冠軍、同時也是前世界第一的安娜·伊凡諾維琪。
原本她預計的第一個紅土賽事為保時捷網球大獎賽，但因傷退賽；因此她該年第一個紅土賽事為馬德里大師賽，她在第一輪擊敗葉卡捷琳娜·馬卡洛娃，但苦於膝蓋受傷而於第二輪輸給羅貝塔·文琪；也因為受傷緣故，她退出羅馬大師賽。接下來的2014年法國網球公開賽，名列第13種子的瓦芝妮雅琪首輪便輸給了雅尼婭·維克梅耶爾。
草地賽事的第一場比賽伊斯特本國際賽，瓦芝妮雅琪擊敗薩曼莎·斯托瑟、斯洛恩·史蒂芬斯、卡美娜·格奧爾基，在四強時輸給了最終冠軍安赫利奎·柯貝；2014年溫布頓網球錦標賽，瓦芝妮雅琪名列第16種子，她先後擊敗莎哈爾·皮爾、Naomi Broady、Ana Konjuh闖進第四輪，這是她第四次到達了溫布頓第四輪，但也是她在溫網的最佳紀錄，她隨後輸給了巴博拉·扎赫拉沃娃-斯特里科娃。
瓦芝妮雅琪以頭號種子身份參加伊斯坦堡盃，首輪以6-0 6-0擊敗貝琳達·本西琪，接下來接連擊敗凱倫·奈普、Karolína Plíšková、克里斯蒂娜·美拉德諾維奇進入決賽，並以6-1 6-1 擊敗羅貝塔·文琪贏得該年第一座WTA單打冠軍，這也是瓦芝妮雅琪連續第七年每年至少奪得一項冠軍。
瓦芝妮雅琪參加的第一場美網系列賽是在蒙特婁舉辦的羅傑斯杯，她一盤未失擊敗達妮埃拉·漢圖霍娃、克拉拉·扎科帕洛娃、Shelby Rogers後進入八強，但在取得第一盤領先後遭到第一種子小威廉絲三盤逆轉擊敗；辛辛那提大師賽，瓦芝妮雅琪先後擊敗瑪格達蓮娜·里巴里科娃、張帥、第6種子安赫利奎·柯貝、第4種子阿格涅什卡·拉德萬斯卡，在四強時遭遇小威廉絲時再度三盤被逆轉擊敗。
2014年美國網球公開賽，瓦芝妮雅琪首輪遭遇瑪格達蓮娜·里巴里科娃，並在第三盤時因對手受傷退賽而晉級，第二輪以直落二擊敗打會外賽進入會內的對手Aliaksandra Sasnovich，第三輪擊敗第十八種子安德烈婭·佩特科維奇，這是她自2012年後首次在大滿貫賽擊敗種子選手；第四輪她擊敗前世界第一暨2006年美網冠軍的第5種子瑪麗亞·莎拉波娃，這是自2012年澳網後瓦芝妮雅琪第一次進入大滿貫八強。八強賽她強勢擊敗第13種子薩拉·埃拉尼，四強面對彭帥時，在領先一盤的情況下，彭帥因不適退賽，瓦芝妮雅琪因而闖入生涯第二次大滿貫決賽，最後仍敗給第一種子小威廉絲。
Wozniacki started her preparation for the Australian Open at the ASB Classic in Auckland seeded as No. 1 and advanced to the final before losing to Venus Williams in three sets. Despite being seeded eighth at the Australian Open, Wozniacki was unfortunate to draw fellow former world number one and two-time champion Victoria Azarenka in the second round, and was defeated in straight sets. After the tournament, she climbed back up to No. 5. Wozniacki then competed at the Dubai Tennis Championships where she made it all the way to the semifinals before losing to eventual champion Simona Halep in three sets. Wozniacki's next tournament was the Qatar Total Open where she was seeded second. However, she lost once again to fellow former No. 1 Victoria Azarenka in the quarterfinals in straight sets, winning just four games. She rebounded at the Malaysian Open, winning the title by defeating Romanian Alexandra Dulgheru in the final in three sets. Wozniacki's next tournament was the BNP Paribas Open where she was seeded fourth. In the second round, she beat Ons Jabeur before losing in the third round to Belinda Bencic in straight sets. She then competed at the Miami Open beating Madison Brengle in the second round and Kaia Kanepi in the third round. She lost to Venus Williams in the fourth round in straight sets.
Wozniacki started her clay season in Stuttgart where she was seeded fourth. In the second round, she beat Lucie Šafářová in straight sets. In the quarterfinals, she dropped just three games against Carla Suárez Navarro to advance to the semifinals. In the semifinals, she beat Simona Halep in a three set thriller to reach her first clay court final since 2011. She lost to Angelique Kerber in the final in three sets, despite serving for the match in the third set. Wozniacki's next tournament was the Mutua Madrid Open where she made it to the quarterfinals for the first time since 2009 beating Jarmila Gajdošová, Christina McHale, and Agnieszka Radwańska. She lost in the quarterfinals to Maria Sharapova in three sets. Wozniacki's next tournament was the Internazionali BNL d'Italia. She lost in the second round to Victoria Azarenka for the third time in straight sets. Wozniacki then played at the French Open as the fifth seed. She beat Karin Knapp in straight sets before losing to Julia Görges in the second round in straight sets.
Wozniacki started her grass season at the Aegon International. She beat Jarmila Gajdošová in straight sets and Svetlana Kuznetsova in three sets to advance to the quarterfinals. She beat Andrea Petkovic in straight sets to advance to the semifinals where she faced Belinda Bencic. She retired from the match due to a back injury after losing the first three games. Wozniacki then played at Wimbledon as the fifth seed. She beat Zheng Saisai in straight sets after being down 1–4 in the first set. After beating Denisa Allertová, she breezed past Camila Giorgi to advance to the fourth round and lost to eventual finalist Garbiñe Muguruza in straight sets. Despite the loss, Wozniacki climbed back up to No. 4 after the tournament.
Wozniacki's summer hard court season got off to a slow start due to an ankle injury. This injury caused her to lose early at Stanford, Toronto and Cincinnati to Varvara Lepchenko, Belinda Bencic and Victoria Azarenka, respectively. Wozniacki then played at the Connecticut Open. She finally picked up her first win by crushing Alison Riske in the first round. She then beat Roberta Vinci in three sets after being down 3–5 in the third set, saving 3 match points in the third set tiebreak, to advance to the quarterfinals. She breezed past Caroline Garcia before losing in the semifinals to Petra Kvitová in straight sets. Wozniacki then played at the US Open as the fourth seed. She easily beat Jamie Loeb in her opening match to advance to the second round where she was upset by Petra Cetkovská in a close three set match despite having four match points.
Wozniacki began her Asian hard court swing at the Toray Pan Pacific Open. As the top seed, she received a bye in to the second round where she easily beat Ana Konjuh. She then defeated Angelique Kerber in three sets in the quarterfinals. In the semifinals, she lost to Belinda Bencic for the fourth straight time in straight sets. Wozniacki's next tournament was the Wuhan Open. She lost to Anna Karolína Schmiedlová in the second round in three sets, despite being up a set and a break. Wozniacki's next tournament was the China Open. She beat Bojana Jovanovski in the first round, and won ten games in a row to beat Qiang Wang to advance to the third round. She lost to Angelique Kerber in straight sets. The loss ended Wozniacki's chances to qualify for the WTA Finals.
Wozniacki's next tournament was the Generali Ladies Linz. She beat Mirjana Lučić-Baroni in three sets before losing to Kirsten Flipkens in the second round in straight sets. Wozniacki failed to qualify for the WTA Finals, but she did qualify for the WTA Elite Trophy.
At the WTA Elite Trophy, Wozniacki was drawn into Group D alongside Roberta Vinci and Svetlana Kuznetsova. After retiring in her first match against Svetlana Kuznetsova, Wozniacki withdrew from the tournament. She finished the year ranked at No. 17, her worst year-end ranking since 2007.
Wozniacki began her 2016 season at the ASB Classic in Auckland, where she was defending finalist points. After beating Danka Kovinić in straight sets, she dropped a combined three games against Christina McHale and Alexandra Dulgheru to advance to the semifinals where she lost to eventual champion Sloane Stephens in straight sets. Wozniacki's next tournament was the Australian Open where she lost to Yulia Putintseva in the first round in three sets, marking her worst performance at the tournament. Wozniacki's next tournament was the St. Petersburg Ladies' Trophy. She lost to Dominika Cibulková in the second round in straight sets. Wozniacki next played the Qatar Open for which she needed 9 match points to beat Ana Konjuh in the first round. She was at one point up by a double break in the third set. In the second round, she faced Daria Gavrilova which she won in straight sets. Wozniacki then played Elena Vesnina in the third round, she fell in a grueling match. Wozniacki played in the 2016 Monterrey Open instead of defending her title in Kuala Lumpur. She defeated Olga Govortsova in the first round and Mirjana Lucic-Baroni in the second round; however, she fell in the quarterfinals to the eventual winner Heather Watson. Caroline then played at the BNP Paribas Open and fell in the second round to Zhang Shuai. This match marked the longest match so far in 2016, at 3 hours and 24 minutes. Then in the 2016 Miami Open Wozniacki made a promising start, defeating Vania King; however, she fell to twelfth seed Elina Svitolina.
Wozniacki was scheduled to play many clay court tournaments. However, she injured her ankle during a practice, which put her out for all of the clay-court season. This break saw Wozniacki fall though the rankings from 22 down to 34, the lowest since May 2008. She withdrew from 2016 French Open because her ankle was not 100%.
Wozniacki played in Nottingham, her first tournament since the Miami Open in March and her first tournament after hiring her new coach David Kotyza. Wozniacki won her first match in ten weeks defeating Çağla Büyükakçay, but falling in yet another three-set match to Anett Kontaveit in the second round. In her last tournament leading up to Wimbledon, Wozniacki played the 2016 Aegon International Eastbourne. She showed signs of improvement from her loss of form and injury, dismissing Alizé Cornet and seventh seed Samantha Stosur and dropping only seven games in the two matches before losing in a three-set match to qualifier Monica Puig. In Wimbledon, she went unseeded in the tournament, the first time since 2008 Australian Open and lost to Svetlana Kuznetsova in the first round, resulting in her falling out of the top 50 for the first time since February 2008. Wozniacki began her US hard court season in Washington, playing the 2016 Citi Open she went on to beat Hiroko Kuwata in the first round and retired in her second round clash with Samantha Stosur despite being up a set 7–5 a sharp pain in her left arm forced her to retire. This injury also took her out of The Rogers Cup. She then played the Summer Olympic Games. Dropping four games she beat Lucie Hradecka but fell to Czech Petra Kvitová in the second round. She failed to win a match in the Connecticut Open as she lost in the first round to young Latvian Jelena Ostapenko. However, Wozniacki's year turned around at the 2016 US Open. She slid past Taylor Townsend in three sets, then upset Svetlana Kuznetsova in round two after being two breaks down she came back to win in straight sets. She then beat Monica Niculescu in two sets to reach the fourth round, in which she upended Madison Keys in two sets to reach the quarterfinals and then beat unseeded Anastasija Sevastova to enter the semifinals. Wozniacki lost the semifinal to then-new No. 1 Angelique Kerber, in two sets, and resulting at the back of the top 30 for the first time since April of this year.
Wozniacki moved on to the Toray Pan Pacific Open. In the first round, Wozniacki defeated Belinda Bencic, who had defeated her the previous year, in three sets. In the second round, she defeated fourth seed Carla Suarez Navarro, then beat qualifier Magda Linette in straight sets. In the semifinals, Wozniacki defeated defending champion Agnieszka Radwanska, which sent her off to her first final since April of the previous year. In the final, she defeated Japanese player Naomi Osaka to win her 24th WTA title, and her first title since March 2015. This was also Wozniacki's first Premier-level title since 2012.
Wozniacki continued the Asian swing at the 2016 Wuhan Open. There, she had a good start, defeating Samantha Stosur in the first round. In the third round, Wozniacki faced Agnieszka Radwanska again, and this time, Radwanska came out on top. Wozniacki then competed at the China Open. She cruised past her first two matches against Coco Vandeweghe and Roberta Vinci before going head to head with Radwanska for the third time in three weeks. Radwanska emerged victorious again, defeating Wozniacki in straight sets. To finish off the Asian leg, Wozniacki partook in the Hong Kong Open. Seeded no. 5, she passed the first rounds easily, defeating Zheng Saisai, Heather Watson, and Wang Qiang.
After beating Jelena Jankovic in the semifinals, Wozniacki won her 2nd title of the season and 25th title overall, beating Kristina Mladenovic in the final in three sets. This was the first time since 2012 that Wozniacki had won two WTA titles in a single season. With the win, Wozniacki returned to the top 20.
Wozniacki ended the season with a run at the Luxembourg Open. The no. 2 seed had an easy first round win against Madison Brengle, and survived a second round encounter against Sabine Lisicki after losing the first set. She then was forced to retire in the quarterfinals due to sickness. Wozniacki did not play at the 2016 WTA Elite Trophy and ended her topsy turvy season ranked number 19 (having been as low as no. 74). Wozniacki began the year at the Auckland Open once again. This time, she was the No. 3 seed. She started out strong, breezing past Nicole Gibbs and Varvara Lepchenko before losing in the quarterfinals Julia Görges in three sets, despite being up a set and 3–1. At the Apia International Sydney, Wozniacki was seeded 10th. She played some solid tennis against Olympic Gold Medallist Monica Puig, winning in three sets. Wozniacki then defeated Yulia Putintseva in straight sets in a rematch of their 2016 Australian Open first round clash. In the quarterfinals, Wozniacki was defeated by Czech Barbora Strycova in three close sets, despite being up a break two times in the final set.
Wozniacki was seeded 17th at the Australian Open. She reached the third round, after defeating Arina Rodionova and Donna Vekic, but was defeated by 9th seed and in-form Johanna Konta in a match which lasted just 75 minutes.
After the Australian Open, Wozniacki played at the Qatar Total Open sliding past Kiki Bertens and Agnieszka Radwanska in the first two rounds in straight sets. She then savied two set points in the first seat to beat Lauren Davis, before dispatching Monica Puig to reach the final. There she fell to the in-form Karolína Plíšková. From there she played at the Dubai Tennis Championships, also making the final there by beating Daria Kasatkina, Viktorija Golubic, Kateryna Bondarenko, Catherine Bellis, and Anastasija Sevastova respectively before coming up short against Elina Svitolina in straight sets in the final. Despite runner up finishes, Wozniacki rose back up to No. 14.
At the BNP Paribas Open, Wozniacki beat Magda Linette, Kateřina Siniaková, and Madison Keys, without the loss of a set, to advance to the quarterfinals where she lost to Kristina Mladenovic. At the Miami Open, Wozniacki beat Varvara Lepchenko and Sorana Cîrstea in straight sets before advancing to the quarterfinals after a retirement from Garbiñe Muguruza. In the quarterfinals, she beat Lucie Šafářová in straight sets and in the semifinals, avenged her Doha loss to Karolína Plíšková by beating her in three sets to advance to her first ever final in Miami and her first Mandatory final since 2013, but then lost in straight sets Johanna Konta, 6-4, 6-3.
Wozniacki and her good friend Serena Williams have met 11 times with Williams leading the head to head 10–1. Williams leads 2–0 in Grand Slams, 8–1 on hard courts, and 1–0 on both clay and grass. Both held the No. 1 ranking from early November 2009 to late January 2012. They are currently the Top 2 active players to hold the No. 1 ranking for the most weeks.
They first met at the 2009 Medibank International Sydney with Williams winning in three tight sets saving match points. Wozniacki's only win over Williams came at the 2012 Sony Ericsson Open where she won in straight sets. In 2014 the rivalry reached its peak with the pair meeting four times and Williams winning all of them. Three of their four meetings went to three sets with Williams coming from a set down in each to win. At the Rogers Cup Wozniacki led by a set and a break before Williams came back to win it. They would meet a week later at the Western & Southern Open where Williams again came from a set down to win. They faced off against each other in the final at the US Open where Williams won in straight sets to claim her 18th Grand Slam title. Their most recent meeting at the WTA Finals was an epic with Wozniacki winning the first set before Williams came back to win the second set. At 4–4 Wozniacki broke Williams to serve for the match and Williams broke back. At 6–5 Wozniacki saved match point with an incredible volley and held serve to take the set to a tiebreak. In the tiebreak Wozniacki was up 4–1 before Williams came back and eventually prevailed.
Despite being rivals, the two maintain a strong friendship off court. Wozniacki visited Williams during her recovery from injury in 2011. In 2014 after they both lost early at the French Open they vacationed together in Miami. They attended a Mariah Carey concert the night before their semifinal match at the WTA Finals. Williams was present during Wozniacki's run at the New York City Marathon. They also went on a mini tour around New York City.
Wozniacki and Agnieszka Radwańska have met 16 times with Wozniacki leading the head to head 10–6. Wozniacki leads 8–6 on hard courts and 2–0 on clay.
They first met at the 2007 Nordea Nordic Light Open with Radwańska winning in straight sets. After that win, Wozniacki would win the next 5 matches before having the streak snapped at the 2012 Apia International Sydney where she lost in three sets. Radwańska would then win the next 2 matches before that streak was snapped at the 2014 Western & Southern Open where she would lose in straight sets. Their most recent meeting was at the 2017 Qatar Total Open where Wozniacki won in straight sets.
Wozniacki and Maria Sharapova have met 10 times with Sharapova leading the head to head 6–4. Wozniacki leads 2–0 in Grand Slams with both coming at the US Open in 2010 and 2014. Wozniacki leads 4–3 on hard courts, while Sharapova leads 3–0 on clay.
The pair first met at the 2008 Qatar Total Open where Sharapova won in straight sets and then again at the 2008 Rome Masters. Wozniacki then won the next two meetings to tie the head-to-head. Sharapova then won the next three meetings including their only meeting in a final at the 2013 BNP Paribas Open. Wozniacki snapped the losing streak by beating Sharapova in three sets at the 2014 US Open and would go on to the reach the final. They met again at the 2014 WTA Finals where Wozniacki won in three sets in a marathon match that lasted over three hours. Their most recent meeting was at the 2015 Mutua Madrid Open where Sharapova won in three sets.