Question: Whom between  Natasha Zvereva and Raúl Ramírez did Gigi Fernández win the most Grand Slam double's championships with?

full_context: Document 1: Rafael Nadal: Rafael "Rafa" Nadal Parera (] , ] ; born 3 June 1986) is a Spanish professional tennis player, currently ranked World No. 1 in men's singles. Known as "The King of Clay", he is widely regarded as the greatest clay-court player in history. His evolution into an all-court threat has established him as one of the greatest tennis players ever.
Document 2: 1999 French Open – Women's Doubles: Martina Hingis and Jana Novotná were the defending champions, but they did not compete together this year. Novotná instead partnered with Natasha Zvereva as the first seed, whereas Hingis partnered with Anna Kournikova as the second seed. Novotná and Zvereva retired in their quarterfinal match against Lindsay Davenport and Mary Pierce, but Hingis and Kournikova reached the final where they lost to American sisters Serena and Venus Williams, 6–3, 6–7, 8–6. This was the first Grand Slam for the Williams sisters and would be their first step towards completing a Career Golden Slam in doubles.
Document 3: Natasha Zvereva: Natasha Zvereva, or Zverava, (born Natallya Maratawna Zverava; Belarusian: Наталля Маратаўна Зверава; 16 April 1971) is a former tennis player from Belarus. Zvereva was the first major athlete in the Soviet Union to demand publicly that she should be able to keep her tournament earnings. The team of Zvereva and Gigi Fernández won more women's doubles titles and Grand Slam women's doubles championships than any other team since that of Martina Navratilova and Pam Shriver.
Document 4: 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.
Document 5: Zina Garrison: Zina Lynna Garrison (born November 16, 1963) is a former professional tennis player from the United States. During her career, she was a women's singles runner-up at Wimbledon in 1990, a three-time Grand Slam mixed doubles champion, and a women's doubles gold medalist and singles bronze medalist at the 1988 Olympic Games. She is currently coaching Taylor Townsend.
Document 6: Tennis in Peru: Luis Horna and Jaime Yzaga are the most famous Peruvian tennis players. Tennis Hall of Famer and Davis Cup and Wimbledon winner Alejandro Olmedo was born in Peru but played for the United States only for Davis Cup. Laura Arraya is a best Peruvian Tennis player in women's. Her brother is Pablo Arraya, a former Peruvian tennis player.
Document 7: Manuel Orantes: Manuel Orantes Corral (] ; born 6 February 1949) is a former tennis player who was active in the 1970s and 1980s. He won the US Open men's singles in 1975, beating defending champion Jimmy Connors in the final. Orantes reached a career-high singles ranking of World No. 2.
Document 8: 1996 US Open – Women's Doubles: Gigi Fernández and Natasha Zvereva were the defending champions and successfully defended their title, defeating Jana Novotná and Arantxa Sánchez Vicario 1–6, 6–1, 6–4 in the final. It was the 5th US Open, 15th Grand Slam and 66th overall title for Fernández, and the 4th US Open, 15th Grand Slam and 60th overall title, in their respective careers.
Document 9: Raúl Ramírez: Raúl Ramírez (born 20 June 1953) is a retired Mexican professional tennis player. He was active during the 1970s and 1980s, and is regarded as one of the great all-around players of the modern era. Ramírez was also the first player to finish first in both singles and doubles Grand Prix point standings, accomplishing the feat in 1976. He attended and played tennis at the University of Southern California in Los Angeles.
Document 10: Guillermo Vilas: Guillermo Vilas (] ; born 17 August 1952) is a retired professional tennis player from Argentina, N°1 of the Grand Prix tennis circuit's Season in 1974, 1975 and 1977, who won four majors, seven Grand Prix Super Series titles and 62 ATP titles. He was inducted into the International Tennis Hall of Fame in 1991. Known for his prolific match play, especially on clay, he became the second man to win more than 900 matches in the Open Era, and his number of match wins on clay are by far the most of the Era. His peak was the 1977 season during which he won two major titles (both on clay), had two long match win streaks of 46 all-surface and 53 on clay, and finished with an Open Era record of match wins. In 2005, Tennis magazine ranked him as the 15th-best male player of the preceding 40 years. He also popularized the between-the-legs tweener shot, also known as the "Gran Willy" in his honor.
Document 11: Larisa Neiland: Larisa Savchenko-Neiland (née Savchenko; born 21 July 1966) is a former professional tennis player who represented the Soviet Union and Latvia. A former world number one ranked doubles player, Neiland won two women's doubles Grand Slam titles and four mixed doubles Grand Slam titles. She also won two singles titles and sixty-five doubles titles.
Document 12: Gonzales–Rosewall rivalry: American tennis player Pancho Gonzales had a long-running rivalry with Australian Ken Rosewall. Gonzales is still sometimes considered to be a candidate for the greatest tennis player of all time; he was the dominant player of the 1950s and still holds the men's all-time record of being ranked world No. 1 for eight years. Rosewall became the world's best player upon Gonzales's semi-retirement in 1961 and held that position either by himself or sharing it with others for six years. Rosewall was signed in 1956 by the promoter Jack Kramer, a former #1 player himself, to join his small band of touring professionals in 1957. He then engaged in a round-the-world, head-to-head tour against Gonzales, the defending world's champion, over the next five months, winning 26 matches but losing 50. In his 1979 autobiography Kramer included both Gonzales and Rosewall in his list of the 21 greatest players of all time. Kramer, however, initially "panicked" upon signing Rosewall.He was a cute little fellow with a dink serve, who operated mostly from the baseline. That great volley of his hadn't been developed yet. I was afraid that Gorgo would eat him alive and put us out of business the rest of the way. But like a lot of people I completely underestimated Rosewall. Before their opening match in Melbourne, Kramer went to Gonzales and asked him to "carry" Rosewall, giving him a better share of the gate to gain his assent. Gonzales did try to carry out his part of the deal for a few matches, but then called it off, telling Kramer that he was no longer able to play his normal game. Kramer agreed. "It was... obvious that Rosewall was not the pushover I had feared. (In fact, Gonzales only beat him 50–26, and it was always competitive.)" Six years older than Rosewall, 13 years later, in 1970, Gonzales defeated him in 6–4, 6–4, in the 199th and next-to-last match they ever played—Gonzales was 42 years old at the time and Rosewall was considered to be the co-No. 1 player in the world.
Document 13: Vera Zvonareva: Vera Igorevna Zvonareva (Russian: Ве́ра И́горевна Звонарёва ; ] ; born 7 September 1984) is a Russian professional tennis player. She was introduced to tennis at the age of six and turned professional in 2000. Her career high is world No. 2 by the WTA. Zvonareva has won twelve WTA Tour singles titles and reached the finals of the 2008 WTA Tour Championships, 2010 Wimbledon Championships, and 2010 US Open. She also was a bronze medalist at the 2008 Beijing Olympics. In doubles, she has won four Grand Slam titles. Two of the titles came in women's doubles, the first one at the 2006 US Open, partnering Nathalie Dechy, and the other at the 2012 Australian Open, partnering Svetlana Kuznetsova. Her other two came in mixed doubles, the first at the 2004 US Open, partnering Bob Bryan, and her second at the 2006 Wimbledon Championships, partnering Andy Ram.
Document 14: Haroon Rahim: Haroon Rahim, (born 12 November 1949) is a Pakistani former tennis player. The former Pakistan and Asian No. 1, Rahim was the youngest tennis player ever to play for Pakistan in the Davis Cup at 15 years of age. He was also the highest ranking Pakistani tennis player ever (a career-high singles ranking of World No. 44 in July 1977). He led the UCLA team to victory with Jeff Borowiak and Jimmy Connors in 1970–71 and was 1971 NCAA doubles champion with Jeff Borowiak.
Document 15: Jorge Lozano: Jorge Lozano (born 17 May 1963 in San Luis Potosí) is a retired professional tennis player from Mexico. He reached his highest doubles ranking of World No. 4 in August 1988. His highest singles ranking was World No. 51, achieved the following month. During his career, he won two mixed doubles titles at the French Open: in 1990 with Arantxa Sánchez, and in 1988 with Lori McNeil. He reached the round of 16 in singles at the 1988 US Open and also the semifinal in doubles that same year. Qualified twice for the Doubles Masters at the Royal Albert Hall in London and reached the semifinals in 1988. In his career, he won nine doubles titles, but no singles titles. He turned professional in 1986, and in his career, he won $U.S.739,424 in prize money. He was the first player to be beaten by Pete Sampras in the main draw of a Grand Slam tournament, at the French Open in 1989. In Davis Cup play, represented Mexico for 15 years, 1981–1995, won 12 doubles matches, and lost 12 as well. He lost 11 singles matches, and won 8, making his overall win / loss record at the Davis Cup 20–23. Lozano won his first title at Forest Hills in 1988, with his partner Todd Witsken, and won his last at Athens in 1993. He resides in Guadalajara, Mexico where he directs a tennis academy for kids and also coaches the men and women tennis team at the University Tec de Monterrey. He is currently the captain of the Mexican Davis Cup Team.
ground_truth: Zvereva and Gigi Fernández won more women's doubles titles and Grand Slam women's doubles