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Total number of titles (a doubles title won by two players representing the same nation counts as only one win for the nation);
Cumulated importance of those titles (one Grand Slam win equalling two Masters 1000 wins, one undefeated ATP Finals win equalling one-and-a-half Masters 1000 win, one Masters 1000 win equalling two 500 events wins, one 500 event win equalling two 250 events wins);
A singles > doubles > mixed doubles hierarchy;
Alphabetical order (by family names for players).
ATP Tour 500
ATP Tour 250
Titles won by player
Titles won by nation
The following players won their first main circuit title in singles, doubles or mixed doubles:
The following is a list of notable players (winners of a main tour title, and/or part of the ATP Rankings top 100 in singles, or top 100 in doubles, for at least one week) who announced their retirement from professional tennis, became inactive (after not playing for more than 52 weeks), or were permanently banned from playing, during the 2021 season:
Alexandr Dolgopolov(born 7 November 1988 in Kyiv, Ukraine) joined the professional tour in 2006 and reached a career-high ranking of No. 13 in singles and No. 42 in doubles, both in January 2012. He won three titles in singles and one title in doubles, as well as reaching one Grand Slam quarterfinal in singles. Having been inactive since his wrist injury in 2018 including his attempted comeback which was slated in 2020, Dolgopolov announced his retirement from the ATP Tour in May 2021.
Guillermo García López(born 4 June 1983 in La Roda, Spain) joined the professional tour in 2002 and reached a career-high ranking of No. 23 in singles in February 2011 and No. 27 in doubles in May 2017. He won five titles in singles and played for the Spanish Davis Cup team. In doubles, he won three titles, reached the final of the 2016 US Open and the semifinals of the 2017 Australian Open. In January 2021, he announced that he would retire after the 2021 season.
Paolo Lorenzi(born 15 December 1981 in Rome, Italy) joined the professional tour in 1999 and reached a career-high ranking of No. 33 in singles in May 2017 and No. 82 in doubles in January 2018. He won one title in singles and one in doubles. He won 21 ATP Challenger Tour titles (third in the all-time leaderboard). He was part of the Italian Davis Cup team. Lorenzi announced the 2021 US Open would be his last professional tournament, and he lost to Maxime Janvier in the second qualifying round.
Lu Yen-hsun(born 14 August 1983 in Taipei, Taiwan) joined the professional tour in 2001 and reached a career-high ranking of No. 33 in singles in November 2010 and No. 86 in doubles in January 2005. In singles, he won 37 challenger titles, the most anyone has won, and reached the Quarterfinals in the 2010 Wimbledon Championships. Lu announced in June that Wimbledon and the Tokyo Olympics would be his last tournaments on the tour.
Leonardo Mayer(born 15 May 1987 in Corrientes, Argentina]) joined the professional tour in 2003 and reached a career-high ranking of No. 21 in singles in June 2015 and No. 48 in doubles in January 2019. He won two titles in singles, both times at the German Open. Mayer retired from tennis in October 2021.
Leander Paes(born 17 June 1973 in Kolkata, West Bengal, India) joined the professional tour in 1991 and reached a career-high ranking of No. 1 in doubles in June 1999 and No. 73 in singles in August 1998. Paes had one singles title win on the ATP Tour: the 1998 Hall of Fame Tennis Championships. He won eight doubles and ten mixed doubles Grand Slam titles. Paes achieved the rare men's doubles/mixed doubles titles feat at the 1999 Wimbledon Championships and his mixed doubles Wimbledon title in 2010 made him the second man (after Rod Laver) to win Wimbledon titles in three separate decades. He won a bronze medal for India in singles at the 1996 Olympic Games and competed at consecutive Olympics from 1992 to 2016, making him the first Indian and only tennis player to compete at seven Olympic Games. He is formerly an Indian Davis Cup captain and holds the record for the most Davis Cup doubles wins, with 44 victories between 1990 and 2019. Paes announced on 25 December 2019 that he would bring the curtains down on his illustrious career in 2020, which was to be his farewell season on the professional tour. However he announced he is hoping to participate in the 2021 Tokyo Olympics before putting an end to his career at the end of the calendar year 2021.
Horia Tec?u(born 19 January 1985 in Constan?a, Romania), former World No. 2 in doubles, won 38 doubles titles.The 36-year-old Romanian won 20 trophies with Jean-Julien Rojer and the pair finished 2015 as the year-end No. 1 team and Nitto ATP Finals champions. Together, they won the 2015 Wimbledon and 2017 US Open crowns.
Viktor Troicki(born 10 February 1986 in Belgrade, SR Serbia, Yugoslavia (now Serbia)) joined the professional tour in 2006 and reached a career-high ranking of 12 in singles in June 2011 and 49 in doubles in October 2010. He won three titles in singles and 2 in doubles. In team competitions, he was part of the Serbia Davis Cup team who won the Davis Cup in 2010, as well as part of the Serbian team who won the inaugural ATP Cup in 2020. Troicki announced on 17 June 2021 that Wimbledon would be his last professional tournament.
The following is a list of notable players (winners of a main tour title, and/or part of the ATP Rankings top 100 in singles, or top 100 in doubles, for at least one week) who returned from retirement during the 2021 season: