2021 ATP Tour
The 2021 ATP Tour was the global elite men's professional tennis circuit organised by the Association of Tennis Professionals (ATP) for the 2021 tennis season. The 2021 ATP Tour calendar comprised the Grand Slam tournaments (supervised by the International Tennis Federation (ITF)), the ATP Finals, the ATP Tour Masters 1000, the ATP Cup, the ATP Tour 500 series and the ATP Tour 250 series. Also included in the 2021 calendar were the Davis Cup (organised by the ITF), the Summer Olympics in Tokyo (rescheduled from 2020), Next Gen ATP Finals, Laver Cup (postponed from 2020), none  of which distributed ranking points. Schedule. This is the complete schedule of events on the 2021 calendar. Affected tournaments. The COVID-19 pandemic affected tournaments on both the ATP and WTA tours. The following tournaments were cancelled or postponed due to the COVID-19 pandemic. Statistical information. These tables present the number of singles (S), doubles (D), and mixed doubles (X) titles won by each player and each nation during the season, within all the tournament categories of the 2021 ATP Tour: the Grand Slam tournaments, the ATP Finals, the ATP Tour Masters 1000, the ATP Tour 500 series, and the ATP  Tour 250 series. The players/nations are sorted by: Titles information. The following players won their first main circuit title in singles, doubles or mixed doubles: The following players defended a main circuit title in singles, doubles, or mixed doubles: Best ranking. The following players achieved their career high ranking in this season inside top 50 (in bold the players who entered the top 10 for the first time): ATP ranking. These are the ATP Rankings and yearly ATP Race Rankings of the top 20 singles players, doubles players and doubles teams at the current date of the 2021 season . Point distribution. "Points are awarded as follows:" Retirements. 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: Comebacks. 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: