The Grand Slam tournaments, also called majors, are the four most important annual tennis events.
 They offer the most ranking points, prize money, public and media attention, the greatest strength and size of field, and greater number of "best of" sets for men.
 The Grand Slam itinerary consists of the Australian Open in mid January, the French Open in May and June, Wimbledon in July, and the US Open in August and September.
 Each tournament is played over a period of two weeks.
 The Australian and United States tournaments are played on hard courts, the French on clay, and Wimbledon on grass.
 Wimbledon is the oldest, founded in 1877, followed by the US in 1881, the French in 1891, and the Australian in 1905.
 However, of these four, only Wimbledon was a major before 1924–25, when all four became designated Grand Slam tournaments.
 Skipping Grand Slam tournaments—especially the Australian Open because of the remoteness, the inconvenient dates (around Christmas and New Year's Day) and the low prize money—was not unusual before 1982, which was the start of the norm of counting Grand Slam titles.
Alicia Molik and Francesca Schiavone were the defending champions, but Molik did not compete this year.
 Schiavone teamed up with Květa Peschke and lost in querterfinals to Elena Likhovtseva and Vera Zvonareva.
Manon Bollegraf and Rennae Stubbs were the defending champions but only Stubbs competed that year with Lisa Raymond.
Lisa Raymond and Rennae Stubbs were the defending champions, but Stubbs decided not to participate.
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Lisa Raymond and Rennae Stubbs were the defending champions, but competed this year with different partners.
 Raymond teamed up with Lindsay Davenport and lost in the first round to Anna Kournikova and Chanda Rubin, while Stubbs teamed up with Conchita Martínez and lost in the final to tournament winners Kim Clijsters and Ai Sugiyama, 6–3, 6–3.
Rennae Stubbs (born 26 March 1971) is an Australian retired tennis player.
 She was an Australian Institute of Sport scholarship holder.
 She has won four Grand Slam doubles titles and two Grand Slam mixed doubles titles.
 She was ranked world No.1 in doubles for three weeks in 2000.
 She represented Australia at four successive Summer Olympic Games: Atlanta 1996, Sydney 2000, Athens 2004, and Beijing 2008.
Elena Bovina and Rennae Stubbs were the defending champions, but had different outcomes.
 While Bovina did not compete this year, Stubbs pertnered with Cara Black and successfully defended her title, defeating Elena Likhovtseva and Magdalena Maleeva 6–0, 6–1 in the final.
 It was the 2nd title in the year for the pair, and the 14th title for Black and 44th title for Stubbs, in their respective careers.
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.
The Williams sisters are two professional American tennis players: Venus Williams (b. 1980), a seven-time Grand Slam title winner (singles), and Serena Williams (b. 1981), twenty-three-time Grand Slam title winner (singles), both of whom were coached from an early age by their parents Richard Williams and Oracene Price.
 There is a noted professional rivalry between them – between the 2001 US Open and the 2017 Australian Open tournaments, they met in nine Grand Slam singles finals.
 They became the first two players, female or male, to play in 4 consecutive grand slam singles finals from the 2002 French Open to the 2003 Australian Open; Serena famously won all 4 to complete the first of two "Serena Slams".
 Between 2000 and 2016, a 17-year span, they collectively won 12 Wimbledon singles titles (Venus won 5 and Serena won 7).
 By winning the 2001 Australian Open women's doubles title, they became the 5th pair to complete the Career Doubles Grand Slam and the only pair to complete the Career Doubles Golden Slam.
 At the time, Venus and Serena were only 20 and 19 years old, respectively.
 Since then they have gone on to add another two Olympic gold medals in the 2008 Beijing Olympics and the 2012 London Olympics.
 Nearly a decade later, the duo would go on to win 4 consecutive grand slam doubles titles from 2009 Wimbledon through 2010 Roland Garros, which would catapult them to co-No.
 1 doubles players on 7 June 2010.
 Two weeks later, on 21 June 2010, Serena would hold the No. 1 singles ranking and Venus would be right behind her at No. 2 in singles.
 Their most recent grand slam doubles titles came at the 2012 Wimbledon & 2016 Wimbledon events.
 They remain very close, often watching each other's matches in support, even after one of them has been knocked out of a tournament.
Alicia Molik (born 27 January 1981) is an Australian former professional tennis player.
 She reached a career-high singles ranking of world No. 8 and won a bronze medal for Australia at the 2004 Athens Olympics by upsetting then world No. 3 and reigning French Open champion Anastasia Myskina.
 Molik peaked in the doubles rankings at No. 6 and won two Grand Slam women's doubles titles, the 2005 Australian Open and the 2007 French Open, alongside Svetlana Kuznetsova and Mara Santangelo, respectively.
 In addition, she won the 2004 Zurich Open, defeating Maria Sharapova in the final, and reached the finals of the 2004 Wimbledon, 2004 US Open, and 2007 Wimbledon mixed doubles events, as well as the quarterfinals of the 2005 Australian Open singles tournament.

Question: Who has won more Grand Slam titles, Rennae Stubbs or Alicia Molik?
Answer: Rennae Stubbs