Tennis is a racket sport played between two opponents (singles) or two teams of two players (doubles). Players use rackets to hit a felt-covered rubber ball over a net and into the opponent's court. The goal is to make a shot that the opponent cannot legally return, thereby scoring a point.
In 1900, the Davis Cup, an annual competition between men's national teams, was established.
The Australian Open dates to 1905 and is one of the four most prestigious events in tennis.
In 1913, the International Lawn Tennis Federation (ILTF), now the International Tennis Federation (ITF), was founded and established three official tournaments as the major championships of the day.
From 1920 to 1930, Bill Tilden won singles titles at Wimbledon three times and the US Championships seven times.
In 1924, tennis withdrew from the Olympics after the 1924 Games, but returned 60 years later.
In 1925, the French Championships, which started in 1891, were opened to all tennis players internationally, previously only open to members of French clubs.
In 1926, promoter C. C. Pyle established the first professional tennis tour, featuring American and French players in exhibition matches for paying audiences.
From 1920 to 1930, Bill Tilden won singles titles at Wimbledon three times and the US Championships seven times.
In 1937, Donald Budge won the first of six consecutive major titles.
In 1938, Donald Budge became the first person to win all four major singles titles during the same calendar year, the Grand Slam.
In 1950, an Associated Press poll named Bill Tilden as the greatest tennis player of the first half of the 20th century.
In 1954, Van Alen founded the International Tennis Hall of Fame, a nonprofit museum in Newport, Rhode Island, containing tennis memorabilia and a hall of fame.
In 1961, a rule change in modern tennis allowed the server to lift their foot off the ground, whereas previously the server had to keep one foot on the ground at all times.
In 1962, Rod Laver won the calendar year Grand Slam, one of two times he has achieved the feat.
In 1963, the Fed Cup, the analogous competition for women's national teams, was founded as the Federation Cup to celebrate the 50th anniversary of the founding of the ITF.
In 1967, Rod Laver won the calendar year Professional Grand Slam.
In 1968, commercial pressures led to the abandonment of the distinction between amateur and professional tennis players, inaugurating the Open Era, which allowed all players to compete in all tournaments.
In 1969, Rod Laver won the calendar year Grand Slam, one of two times he has achieved the feat.
In 1979, Jack Kramer said that, based on consistent play, Donald Budge was the greatest player ever in his autobiography.
In 1984, tennis returned to the Olympics as a 21-and-under demonstration event, 60 years after it withdrew from the Olympics.
In 1988, Andre Agassi chose to skip Wimbledon, citing the event's traditionalism, particularly its "predominantly white" dress code.
In 1988, tennis was consistently competed in the Summer Olympic Games, marking its return as one of the original Olympic sports.
In 1988, tennis was reintroduced as a full-medal sport at the Seoul Olympics, following a successful demonstration event in 1984.
In 1990, Andre Agassi continued to skip Wimbledon, citing the event's traditionalism, particularly its "predominantly white" dress code.
In 1990, the ATP, led by Hamilton Jordan, began running the men's tour and designated the top nine tournaments, outside of the Grand Slam events, as "Super 9" events.
In 1997, the maximum length of the tennis racket frame was shortened from 32 inches (81 cm) to 29 inches (74 cm).
In December 1999, Steffi Graf was named the greatest female tennis player of the 20th century by a panel of experts assembled by the Associated Press.
For the 2000 Olympics, Lisa Raymond was passed over for Team USA in favour of Serena Williams by captain Billie Jean King, even though Raymond was the top-ranked doubles player in the world at the time, and Raymond unsuccessfully challenged the selection.
In 2000, the "Super 9" events became the Tennis Masters Series.
In 2004, the ITF implemented a new ranking scheme to encourage greater participation in doubles, by combining singles and doubles rankings into one combined tally.
In 2004, the Tennis Masters Series became the ATP Masters Series.
In 2006, Billie Jean King stated that Martina Navratilova is the greatest singles, doubles, and mixed doubles player ever.
In August 2007, the ATP announced major changes to the tour that were introduced in 2009.
In 2007, the Australian Open and Wimbledon introduced the Hawk-Eye challenge system for challenging line calls.
In June 2008, the Bleacher Report ranked Martina Navratilova as the top female player of all time.
In 2009, a rule change in women's tennis for WTA Tour events allowed coaching on court on a limited basis during a match, with the player able to request her coach once per set.
In 2009, the Masters Series was renamed to the "ATP Masters 1000", with the number referring to the ranking points earned by the winner.
In July 2010, John Wertheim of Sports Illustrated stated that Serena Williams is the greatest female tennis player ever.
As of 2011, six of the nine "1000" level tournaments are combined ATP and WTA events.
In March 2012, the Tennis Channel published a combined list of the 100 greatest men and women tennis players of all time.
In 2012, the Dubai Tennis Championships offered the largest financial incentive to players, with total prize money of US$2,313,975.
In November 2018, Tennis.com polled its readers, and Graf was chosen as the greatest women's tennis player of all time.
As of 2018, at the US Open, the men's and women's singles prize money (US$40,912,000) accounts for 80.9 percent of total player base compensation, while men's and women's doubles (US$6,140,840), men's and women's singles qualifying (US$3,008,000), and mixed doubles (US$505,000) account for 12.1 percent, 5.9 percent, and 1.0 percent, respectively. The singles winner receives US$3,800,000, while the doubles winning pair receives $700,000 and the mixed doubles winning pair receives US$155,000.
In 2018, a Tennis.com panel selected Serena Williams as the greatest female tennis player in the Open Era.
In May 2020, the Tennis Channel ranked Serena Williams as the greatest female tennis player of all time.
In July 2020, The Guardian polled its readers to determine the greatest female tennis player of the past 50 years, with Graf being the clear favorite.
In 2021, the WTA rebranded, resembling the men's tournament series, and also providing extra simplicity for fans and consumers.
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