Question: Which tennis player won numerous doubles titles, Rika Hiraki or František Čermák?
Context: Mahesh Shrinivas Bhupathi (born 7 June 1974) is a retired Indian professional tennis player.  In 1997, he became the first Indian to win a Grand Slam tournament (with Rika Hiraki).  With his win at the Australian Open mixed doubles in 2006, he joined the elite group of eight tennis players who have achieved a career Grand Slam in mixed doubles.  He is also the founder of International Premier Tennis League.  In December 2016, Bhupathi was appointed as India's next non-playing Davis Cup captain and took over the reins from Anand Amritraj in February 2017. Lucie Hradecká (] ; born 21 May 1985 in Prague) is a professional tennis player from the Czech Republic.  In her career, Hradecká has won 19 WTA doubles titles, and two Grand Slam titles, the 2011 French Open and the 2013 US Open, partnered both times by fellow Czech Andrea Hlaváčková.  The pair are also the 2012 Olympic silver medallists in doubles.  She has also won a mixed doubles Grand Slam title, the 2013 French Open with František Čermák.  Her biggest singles career highlight to date was defeating former world number one Ana Ivanovic in the first round of the 2015 Australian Open. Rosalyn Doris Fairbank-Nideffer (born 2 November 1960) is a retired female professional tennis player from South Africa.  She played her first grand slam in 1979, with her last appearance coming as late as 1997.  She won a WTA Tour singles event in Richmond in 1983 and numerous doubles titles, with the highlight being her Grand Slam titles at the 1981 French Open with Tanya Harford and 1983 with Candy Reynolds.  She won 317 singles and 472 doubles matches on the tour during her long career. 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. Leoš Friedl (born 1 January 1977 in Jindřichův Hradec) is an inactive Czech professional tennis player best known for his doubles play with František Čermák.  He is coached by Lubomir Gerla.  During his career, Friedl won 16 top-level doubles titles and the 2001 Wimbledon mixed doubles title with Daniela Hantuchová, where they beat Mike Bryan and Liezel Huber, 4–6, 6–3, 6–2. Pamela Howard Shriver (born July 4, 1962) is an American former professional tennis player known primarily as a doubles specialist with success also as a singles player.  She currently is a tennis broadcaster for ESPN.  During the 1980s and 1990s, she won 133 titles, including 21 women's singles titles, 111 women's doubles titles and one mixed doubles title.  In Grand Slam tournaments, Shriver won 21 doubles titles and one mixed doubles title.  She also won a women's doubles gold medal at the 1988 Olympic Games in Seoul with Zina Garrison as her partner. Elizabeth Montague Ryan (February 5, 1892 – July 6, 1979) was an American tennis player who was born in Anaheim, California but lived most of her life in the United Kingdom.  Ryan won 26 Grand Slam titles.  Nineteen of those titles were in women's doubles and mixed doubles at Wimbledon, an all-time record for those two events.  Twelve of her Wimbledon titles were in women's doubles and seven were in mixed doubles.  Ryan also won four women's doubles titles at the French Championships, as well as one women's doubles title and two mixed doubles titles at the U.S. Championships. Althea Louise Brough Clapp ("née" Brough; March 11, 1923 – February 3, 2014) was an American tennis player.  During her career between 1942 and 1957, she won six Grand Slam singles titles as well as numerous doubles and mixed doubles titles.  She was ranked world no. 1 by Lance Tingay in 1955. Rika Hiraki (Japanese: 平木 理化 , born 6 December 1971) is a former professional Japanese female tennis player. František Čermák (born 14 November 1976) is a Czech professional tennis player.  He has won 31 doubles titles on the ATP Tour and has been a finalist 24 times.  He achieved a career-high doubles ranking of World No. 14 in February 2010.  He usually plays doubles with Filip Polášek.  In mixed doubles, Čermák and partner Lucie Hradecká reached the final of the 2013 Australian Open and won the 2013 French Open.  In singles, Čermák won 1 Challenger title and 10 Futures titles, reaching a career-high singles ranking of World No. 201 in October 2003.
Answer: František Čermák