Question: What is the name of the American, two-time defending, professional tennis player who is regarded by some as the greatest female tennis player of all time?

Documents:
source: Serena Williams
text: Serena Williams Serena Jameka Williams (born September 26, 1981) is an American professional tennis player. The Women's Tennis Association (WTA) has ranked her world No. 1 in singles on eight occasions, from 2002 to 2017. She became the world No. 1 for the first time on July 8, 2002. On the sixth occasion, she held the ranking for 186 consecutive weeks, tying the record set by Steffi Graf for the most consecutive weeks as world No. 1 by a female tennis player. In total, she has been world No. 1 for 319 weeks, which ranks her third in the Open Era among female tennis players. Some commentators, players and sports writers regard her as the greatest female tennis player of all time.

source: 2004 Wimbledon Championships – Women's Singles
text: 2004 Wimbledon Championships – Women's Singles Serena Williams was the two-time defending champion, but she was defeated by 17-year-old Maria Sharapova in the final, 6–1, 6–4. This victory was hailed by the media as "the most stunning upset in memory". With this win, Sharapova, who was to become a future world No. 1, entered the top ten for the first time in her career. She also became the third-youngest woman to win Wimbledon (behind Lottie Dod and Martina Hingis), and the second Russian woman (after Anastasia Myskina won the French Open earlier that year) to win a Grand Slam title.

source: Peng Shuai
text: Peng Shuai Peng Shuai (; ; born 8 January 1986) is a Chinese professional female tennis player. She reached a career high ranking of World No. 1 in doubles by the Women's Tennis Association on 17 February 2014, making her the first Chinese professional tennis player (male or female, and in singles or doubles) to reach World No. 1. She won a gold medal at the 2010 Asian Games, defeating Akgul Amanmuradova in the final. At the 2013 Wimbledon Championships, Peng won her first ladies' double championship with Hsieh Su-wei of Taiwan and again won at the 2014 French Open with Hsieh.

source: Anastasia Myskina
text: Anastasia Myskina Anastasiya Andreyevna Myskina (Russian: Анастасия Андреевна Мыскина ; ] ; born 8 July 1981) is a Russian former tennis player. She won the 2004 French Open singles title, becoming the first Russian female tennis player to win a Grand Slam singles title. Subsequent to this victory, she rose to No. 3 in the WTA rankings, becoming the first Russian female tennis player to reach the top 3 in the history of the rankings. In September 2004, she reached a career-high ranking of No. 2. She has not officially retired, but has been inactive on the WTA Tour since May 2007.

source: Martina Navratilova
text: Martina Navratilova Martina Navratilova (Czech: "Martina Navrátilová" ] ; born Martina Šubertová ] ; October 18, 1956) is a former Czechoslovak and later American tennis player and coach. In 2005, "Tennis" magazine selected her as the greatest female tennis player for the years 1965 through 2005 and she is considered one of the best, if not the best, female tennis players of all time.

source: Ace Against Odds
text: Ace Against Odds Ace Against Odds is the 2016 biography of the Indian professional tennis player Sania Mirza. The book is her official biography chronicling her journey to becoming one of India and world's top female tennis player. The book also contains some memorable encounters of the player on and off the court and the people and relationships that have contributed to her growth as a person and a sportsperson.

source: Best Female Tennis Player ESPY Award
text: Best Female Tennis Player ESPY Award The Best Female Tennis Player ESPY Award has been presented annually since 1993 to the professional female tennis player adjudged to be the best in a given calendar year.

source: Albert Burke (tennis)
text: Albert Burke (tennis) Albert Burke (1901 – 1958) was an Irish professional tennis player based in France. Albert Burke was the son of Thomas Burke. Thomas Burke was a professional tennis player when professional tennis began in the late 19th century and Albert Burke's brother Edmund Burke was also a professional tennis player . Albert Burke won the Bristol Cup in France (the top professional tournament in the world in the 1920s), in 1924 and 1925 (beating Roman Najuch in both finals) . He was also losing finalist in the Bristol Cup in 1926, 1929 and 1931 (losing all three finals to Karel Kozeluh) . Burke finished second in the 1930 French Pro Championship round robin (Karel Kozeluh was first) . At the US Pro Tennis Championships Burke was a quarter finalist in 1931 (losing to Howard Kinsey) and 1932 (losing to Bill Tilden) . At the Wembley Championships Burke lost in the quarter finals in 1935 (losing to Ellsworth Vines) .

source: Suzanne Lenglen
text: Suzanne Lenglen Suzanne Rachel Flore Lenglen (] ; 24 May 1899 – 4 July 1938) was a French tennis player who won 31 Championship titles between 1914 and 1926. She dominated women's tennis from 1914 until 1926 when she turned professional. A flamboyant, trendsetting athlete, she was the first female tennis celebrity and one of the first international female sport stars, named "La Divine" (the Goddess) by the French press. Lenglen's 241 titles, 181 match winning streak and 341-7 (98%) match record are hard to imagine happening in today's tennis atmosphere. Lenglen is regarded by some to be the greatest female tennis player in history.

source: Audra Cohen
text: Audra Cohen Audra Marie Cohen (born April 21, 1986, in California) is a former American professional tennis player. Now living in Plantation, Florida, she was the # 1 collegiate female tennis player in the United States in 2007. She is currently the head women's tennis coach at the University of Oklahoma.

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Answer: Serena Williams