Question: Which tennis player, Marion Bartoli or Geoff Masters, had a more prominent career in singles tennis matches?

full_context: Document 1: 1970 Australian Open – Men's Doubles: Bob Lutz and Stan Smith defeated John Alexander and Phil Dent 6–3, 8–6, 6–3 in the final to win the Men's Doubles title at the 1970 Australian Open.
Document 2: 2011 Aegon International – Women's Singles: Ekaterina Makarova was the defending champion, but lost to Petra Kvitová in the second round. Kvitová eventually lost the final 1–6, 6–4, 5–7 to Frenchwoman Marion Bartoli. It was Bartoli's first title of the year and sixth of her career. It was her second Premier-level career title and first on grass courts.
Document 3: 2008 French Open – Women's Singles: Justine Henin was the three-time defending champion, but she retired from the sport on May 14, 2008. Her retirement left Serena Williams as the only former French Open champion remaining in the women's draw. Williams was defeated in the third round by Katarina Srebotnik, meaning that there would be a first-time French Open champion in 2008.
Document 4: Vitas Gerulaitis: Vytautas Kevin Gerulaitis (July 26, 1954 – September 17, 1994) was an American professional tennis player. In 1975, Gerulaitis won the men's doubles title at Wimbledon, partnering with Sandy Mayer. He won the men's singles title at one of the two Australian Open tournaments held in 1977 (Gerulaitis won the tournament that was held in December, while Roscoe Tanner won the earlier January tournament). Gerulaitis also won two Italian Open titles, in 1977 and 1979, and the WCT Finals in Dallas, in 1978.
Document 5: Li Na: Li Na (; ; born 26 February 1982) is a retired Chinese professional tennis player, who achieved a career-high WTA-ranking of world No. 2 on 17 February 2014. Over the course of her career, Li won seven WTA singles titles and two Grand Slam singles titles at the 2011 French Open and 2014 Australian Open. Li's rise to prominence came after those victories, which made her the first and only Grand Slam singles champion from East Asia and Asia as a whole. Prior to this, she had already become the first player representing an East Asian and Asian country to appear in a Grand Slam singles final, a milestone she achieved at the 2011 Australian Open. Li was also the runner-up at the 2013 Australian Open and 2013 WTA Tour Championships, a three-time quarterfinalist at Wimbledon and a semifinalist at the 2008 Beijing Olympic Games and 2013 US Open. Among her other most notable accolades, she was the first Chinese player to win a WTA tour title at the Guangzhou International Women's Open in 2004, the first to reach a Grand Slam singles quarterfinal at the 2006 Wimbledon Championships, and the first to break into the world's top 10. Her feats have sparked a major population growth of tennis players in East Asia, earning her the reputation as the region's tennis pioneer and trailblazer.
Document 6: Geoff Masters: Geoff Masters (born 19 September 1950) is an Australian former tennis player. He was part of doubles winning pairs in the US Open, Australian Open and Wimbledon tournaments during the 1970s.
Document 7: Mats Wilander: Mats Wilander (] ; born 22 August 1964) is a former World No. 1 tennis player from Sweden. From 1982 to 1988, he won seven Grand Slam singles titles (three at the French Open, three at the Australian Open, and one at the US Open), and one Grand Slam men's doubles title (at Wimbledon).
Document 8: Ken Rosewall: Kenneth Robert Rosewall {'1': ", '2': ", '3': 'AM, MBE', '4': "} (born 2 November 1934) is a former world top-ranking amateur and professional tennis player from Australia. He won a record 23 tennis Majors including 8 Grand Slam singles titles and before the Open Era a record 15 Pro Slam titles and a record 35 Major finals overall. He won the Pro Grand Slam in 1963. Rosewall won 9 slams in doubles with a career double grand slam. He is considered to be one of the greatest tennis players of all time. He had a renowned backhand and enjoyed a long career at the highest levels from the early 1950s to the early 1970s. Rosewall was one of the two best male players for about nine years and was the World No. 1 player for a number of years in the early 1960s. He was ranked among the top 20 players, amateur or professional, every year from 1952 through 1977. Rosewall is the only player to have simultaneously held Pro Grand Slam titles on three different surfaces (1962–1963). At the 1971 Australian Open he became the first male player during the open era to win a Grand Slam tournament without dropping a set.
Document 9: Roger Taylor (tennis): Roger Taylor MBE (born 14 October 1941) is a British former tennis player. Born in Sheffield, South Yorkshire, he won 6 singles titles and 10 doubles titles during his career. He achieved success at several Grand Slam tournaments, reaching the quarter-finals of the French Open in 1973, the semi-finals of Wimbledon during the same year and winning back to back US Open Men's Doubles titles in 1971 and 1972. He also enjoyed particular success in 1970, again reaching the semi-finals of Wimbledon, where he achieved a big upset win over defending champion Rod Laver en route, and the semi-finals of the Australian Open. Taylor also reached the semi-finals at Wimbledon in 1967. His career-high ATP singles ranking was World No. 11, though Taylor was ranked World No. 8 in 1970 before the ATP rankings began.
Document 10: Phil Dent: Philip Clive Dent (born 14 February 1950), is a former professional tennis player. Dent's high water mark as a pro singles player was reaching the Australian Open final in 1974, which he lost to Jimmy Connors in four sets. Dent was also the Men's Doubles champion at the Australian Open in 1975 (with teammate John Alexander), and the Mixed Doubles champion at the US Open in 1976 (with teammate Billie Jean King).
Document 11: Iva Majoli: Iva Majoli Marić (Iva Majoli) (born 12 August 1977) is a former professional tennis player from Croatia. She upset Martina Hingis to win the women's singles title at the French Open in 1997. Majoli also won seven other singles titles and one doubles title during her career. She reached a career-high singles ranking of world No. 4 in February 1996.
Document 12: Garbiñe Muguruza: Garbiñe Muguruza Blanco (] ; born 8 October 1993) is a Spanish-Venezuelan tennis player who is currently ranked world No. 1 in singles by the Women's Tennis Association (WTA). Since turning professional in 2012, she has won five singles titles, including two majors at the 2016 French Open and the 2017 Wimbledon Championships.
Document 13: Marty Riessen: Marty Riessen (born December 4, 1941) played amateur and professional tennis in the 1960s and 1970s. He was ranked as high as No. 11 in the world in singles on the ATP Rankings in September 1974, though was ranked as high as World No. 8 by Lance Tingay of The Daily Telegraph in 1971, before the computer rankings. Renowned for his doubles play, Riessen was also a regular doubles partner of Australian tennis great Margaret Court, winning six of his seven major mixed titles and a career grand slam alongside her. Additionally a winner of two men's doubles grand slams, his highest doubles ranking was No. 3 on March 3, 1980.
Document 14: Marion Bartoli: Marion Bartoli (] ; born 2 October 1984) is a French former professional tennis player. She won the 2013 Wimbledon Championships singles title after previously being runner-up in 2007 and was a semifinalist at the 2011 French Open. She also won eight Women's Tennis Association singles titles and three doubles titles. She announced her immediate retirement from professional tennis on 14 August 2013.
Document 15: Marion Bartoli career statistics: This is a list of the main career statistics of tennis player Marion Bartoli.
ground_truth: Marion Bartoli