Zhao Yunlei (born August 25, 1986) is a mixed and women's doubles badminton athlete from China.
 She graduated with a BA from Huazhong University of Science and Technology.
 She is the first and only badminton player to have ever won two Gold medals in the same Olympic edition, winning in both the Mixed and Women's Doubles categories in 2012.
 Zhao joins the ranks with nine other players with two Olympic Gold Medals, the highest number of Gold Medals won by any badminton athlete.
 Through her performance at the 2014 and 2015 BWF World Championships, she became the first player to win two consecutive gold medals in two consecutive BWF World Championships.
The Global Water Foundation (GWF) is a non-profit organisation dedicated to delivering clean water and sanitation to the world's neediest communities.
 Professional tennis player Johan Kriek founded the organisation in 2005 after attending meetings of the World Economic Forum in Cape Town, South Africa.
 The goals of the GWF echo the Millennium Development Goals established at the United Nations' Millennium Summit in September 2000.
Beatriz "Gigi" Fernández (born February 22, 1964) is a former professional tennis player.
 She turned professional in 1983 and is the first Puerto-Rican-born athlete to win a Gold Medal, and the first to be inducted into the International Tennis Hall of Fame.
Nikolai Yefimovich Andrianov (Russian: Николай Ефимович Андрианов , 14 October 1952 – 21 March 2011) was a Soviet/Russian gymnast.
 He held the record for men for the most Olympic medals at 15 (7 gold medals, 5 silver medals, 3 bronze medals) until Michael Phelps surpassed him at the 2008 Beijing Summer Olympics.
 Andrianov is the third athlete (male or female) in cumulative Olympic medals after Phelps's 28 and Larisa Latynina, who earned 18.
 Andrianov won the most medals at the 1976 Summer Olympics with 6 individual medals and one team medal.
 Within the sport of Men's Artistic Gymnastics, he also holds the men's record for most individual Olympic medals (12) and shares the male record for most individual Olympic gold medals in gymnastics (6), tied with Boris Shakhlin and Dmitry Bilozerchev (the latter of which only if you count the 1984 Alternate Olympics).
 In many other rankings among all-time medal winners at the Olympic, World, and European levels, he ranks very high, (for example, he is second only to Vitaly Scherbo in total individual medal counts at either the gold level or any level at the combined Olympic and World levels as well as at the combined Olympic, World, and European levels) – easily making him one of the most decorated gymnasts of all time.
Vilho "Ville" Eino Ritola (18 January 1896 – 24 April 1982) was a Finnish long-distance runner.
 Known as one of the "Flying Finns", he won five Olympic gold medals and three Olympic silver medals in the 1920s.
 He holds the record of winning most athletics medals in one Olympic games event - four golds and two silvers in Paris 1924.
 He has won the second biggest number of athletics Olympic gold medals in one event.
Mary Joe Fernández Godsick (born María José Fernández; August 19, 1971) is an American former professional tennis player.
 She reached a career-high ranking of world No. 4 in both singles and doubles.
 Fernández was the runner-up in three Grand Slam singles tournaments and won two Grand Slam women's doubles titles and two Olympic gold medals.
Johan Kriek (born April 5, 1958) is a South African-American professional male tennis player and founder of the Global Water Foundation, a non-profit organization dedicated to delivering clean water to the world's neediest communities.
 Kriek won two Australian Opens and reached the semifinals at the French Open and US Open, as well as the quarterfinals of Wimbledon.
 He won 14 professional singles and 8 doubles titles, reaching a career-high singles ranking of World No. 7.
 Kriek's most memorable wins include victories over Andre Agassi, Jimmy Connors, John McEnroe, Guillermo Vilas, Stefan Edberg, Michael Chang, Vitas Gerulaitis and Björn Borg.
Ralf Schumann (born June 10, 1962) is a German 25 m Rapid Fire Pistol shooter.
 He is a three-time Olympic Champion and twice the World Champion.
 One of the most decorated shooters of the modern era, he is the first of two sport shooters to have won three Olympic gold medals in one individual event (25 metre rapid fire pistol) and became the first of three sport shooters to have won three Olympic individual gold medals.
 He won the gold medals for the 25 metre rapid fire pistol event at the 1992, 1996 and 2004 Olympics and also won two silver medals at this event, becoming the most successful Olympic shooter at this event.
 Schumann has participated in seven consecutive Olympic Games since 1988, setting a new record for most Olympic appearances by a German athlete.
Nicolás Alejandro Massú Fried (born October 10, 1979), nicknamed "El Vampiro" (Spanish: "the vampire"), is a Chilean former tennis player, a former World No. 9 in singles, and a winner of two Olympic gold medals.
 He is the only male player to have won both the singles and doubles gold medals during the same games in modern Olympic tennis (since 1988), the only two gold medals Chile has won at the Olympics.
 Massú also reached the final of the 2003 Madrid Masters and won six singles titles.
Michael Fred Phelps II (born June 30, 1985) is an American former competitive swimmer and the most decorated Olympian of all time, with a total of 28 medals.
 Phelps also holds the all-time records for Olympic gold medals (23), Olympic gold medals in individual events (13), and Olympic medals in individual events (16).
 In winning eight gold medals at the 2008 Beijing Games, Phelps broke fellow American swimmer Mark Spitz's 1972 record of seven first-place finishes at any single Olympic Games.
 At the 2004 Summer Olympics in Athens, Phelps had already tied the record of eight medals of any color at a single Games by winning six gold and two bronze medals.
 At the 2012 Summer Olympics in London, Phelps won four gold and two silver medals, and at the 2016 Summer Olympics in Rio de Janeiro, he won five gold medals and one silver.
 This made him the most successful athlete of the Games for the fourth Olympics in a row.

Question: Which tennis player won more Olympic gold medals: Johan Kriek or Gigi Fernández?
Answer: Beatriz "Gigi" Fernández