2009 Serena Williams tennis season
Serena Williams's 2009 tennis season officially began at the 2009 Medibank International Sydney.
 Williams finished the year ranked world no. 1 for the second time in her career, having played in 16 tournaments, more than any other year.
 She also broke the record previously set by Justine Henin for the most prize money earned by a female tennis player in one year, with Williams earning $6,545,586.
 In doubles, she finished the year ranked world no. 3, despite playing only six tournaments as a pair.
 She won five Grand Slam titles, putting her total Grand Slam titles at 23.
Grand Slam (tennis)
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.
2017 Australian Open – Men's singles final
The 2017 Australian Open Men's Singles final was the championship tennis match of the Men's Singles tournament at the 2017 Australian Open.
 It was contested between Roger Federer and Rafael Nadal, ranked 17th and 9th in the world respectively.
 It was their record ninth meeting in a Grand Slam final in their rivalry, and their 1st meeting in a Grand Slam final since the 2011 French Open.
 In a rematch of the 2009 Australian Open final, which Nadal won in 5 sets, Roger Federer won the duel in 5 sets, beating Nadal for the first time in a Grand Slam since the 2007 Wimbledon final.
 He also trailed Nadal 3–1 in the final set but won 5 games in a row to win the title.
 This ended a 6-match losing streak against Nadal in Grand Slam events.
 Having lost all of their previous three encounters, this was the first time Federer defeated Nadal at the Australian Open and also marked Federer's first Grand Slam victory over Nadal outside the grass courts of Wimbledon.
 Federer extended his record of Grand Slam men's singles titles to 18, marking the third time he broke his own all-time record, after breaking the previous record of 14, held by Pete Sampras.
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.
Williams sisters
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.
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.
Pam Teeguarden
Pam Teeguarden (born April 17, 1951) is a former American professional tennis player in the 1970s and 1980s, ranked in the top 20 from 1970–1975, according to "John Dolan's Women's Tennis Ultimate Guide", prior to computer rankings.
 She won two Grand Slam Doubles Titles and was a quarter finalist in singles at the U.S. Open and The French Open.
 Her father Jerry, a well known coach, helped Margaret Court win the coveted Grand Slam (all four Grand Slam titles in one year) in 1970 and Virginia Wade to her 1977 Wimbledon triumph.
 Teeguarden was voted the "Most Watchable Player" based on play and appearance by a group of Madison Avenue advertising executives or "Mad Men" while playing at the US Open.
 Teeguarden played in 19 consecutive US Opens, holding the record until Chris Evert played in 20.
 She wore the first all black outfit in the history of tennis in 1975 at The Bridgestone Doubles Championships in Tokyo, starting a trend that is still popular today.
 Teeguarden was the first woman tennis player signed by Nike.
 She played on the victorious Los Angeles Strings Team Tennis team in 1981 and won the Team Tennis Mixed Doubles Division with Tom Gullikson in 1977; they were also runners-up in the league that year.
1991 Australian Open – Men's Doubles
Pieter Aldrich and Danie Visser were the defending champions, but lost in the first round to Paul Haarhuis and Mark Koevermans.
<br> Scott Davis and David Pate won the title, defeating Patrick McEnroe and David Wheaton 6–1, 4–6, 6–4, 5–7, 9–7, in the final.
 This was Pate's first Grand Slam title and final, despite gaining the World No. 1 ranking two weeks earlier.

Question: Have Jonathan Stark and Pieter Aldrich won the same number of Grand Slam titles?
Answer: yes