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| Tournament | Start Date | End Date |
| Antalya Open | 7-January-2021 | 13-January-2021 |
| Delray Beach Open | 7-January-2021 | 13-January-2021 |
| Melbourne 1 | 31-January-2021 | 6-February-2021 |
| Melbourne 2 | 31-January-2021 | 6-February-2021 |
| ATP Cup | 1-February-2021 | 5-February-2021 |
| Australian Open | 8-February-2021 | 21-February-2021 |
| Cordoba Open | 22-February-2021 | 28-February-2021 |
| Open Sud de France | 22-February-2021 | 28-February-2021 |
| ABN AMRO World Tennis Tournament | 1-March-2021 | 7-March-2021 |
| Argentina Open | 1-March-2021 | 7-March-2021 |
| Chile Open | 8-March-2021 | 14-March-2021 |
| Open 13 | 8-March-2021 | 14-March-2021 |
| Qatar Open | 8-March-2021 | 13-March-2021 |
| Dubai Tennis Championships | 15-March-2021 | 20-March-2021 |
| Mexican Open | 15-March-2021 | 20-March-2021 |
| Miami Open | 24-March-2021 | 4-April-2021 |
| Grand Prix Hassan II | 5-April-2021 | 11-April-2021 |
| US Men's Clay Court Championships | 5-April-2021 | 11-April-2021 |
| Monte-Carlo Masters | 11-April-2021 | 18-April-2021 |
| Barcelona Open | 19-April-2021 | 25-April-2021 |
| Hungarian Open | 19-April-2021 | 25-April-2021 |
| Estoril Open | 26-April-2021 | 2-May-2021 |
| Bavarian International Tennis Championships | 26-April-2021 | 2-May-2021 |
| Madrid Open | 2-May-2021 | 9-May-2021 |
| Italian Open | 9-May-2021 | 16-May-2021 |
| Geneva Open | 16-May-2021 | 22-May-2021 |
| Lyon Open | 16-May-2021 | 22-May-2021 |
| French Open | 23-May-2021 | 6-June-2021 |
| Mercedes Cup | 7-June-2021 | 13-June-2021 |
| Libema Open | 7-June-2021 | 13-June-2021 |
| Queen's Club Championships | 14-June-2021 | 20-June-2021 |
| Halle Open | 14-June-2021 | 20-June-2021 |
| Mallorca Open | 20-June-2021 | 26-June-2021 |
| Nature Valley International | 20-June-2021 | 26-June-2021 |
| Wimbledon | 28-June-2021 | 11-July-2021 |
| German Open | 12-July-2021 | 18-July-2021 |
| Hall of Fame Open | 12-July-2021 | 18-July-2021 |
| Swedish Open | 12-July-2021 | 18-July-2021 |
| Los Cabos Open | 19-July-2021 | 25-July-2021 |
| Croatia Open | 19-July-2021 | 25-July-2021 |
| Swiss Open | 19-July-2021 | 25-July-2021 |
| Tokyo Olympics 2020 | 24-July-2021 | 30-July-2021 |
| Austrian Open KitzbÃŧhel | 26-July-2021 | 1-August-2021 |
| Atlanta Open | 26-July-2021 | 1-August-2021 |
| Washington Open | 2-August-2021 | 8-August-2021 |
| Canadian Open | 9-August-2021 | 15-August-2021 |
| Cincinnati Masters | 15-August-2021 | 22-August-2021 |
| Winston-Salem Open | 22-August-2021 | 28-August-2021 |
| US Open | 30-August-2021 | 12-September-2021 |
| St. Petersburg Open | 20-September-2021 | 26-September-2021 |
| Moselle Open | 20-Septemebr 2021 | 26-September-2021 |
| Laver Cup | 24-September-2021 | 26-September-2021 |
| Sofia Open | 27-September-2021 | 3-October-2021 |
| Chengdu Open | 27-September-2021 | 3-October-2021 |
| Zhuhai Championships | 27-September-2021 | 3-October-2021 |
| China Open | 4-October-2021 | 10-October-2021 |
| Japan Open | 4-October-2021 | 10-October-2021 |
| Shanghai Masters | 10-October-2021 | 17-October-2021 |
| Kremlin Cup | 18-October-2021 | 24-October-2021 |
| Stockholm Open | 18-October-2021 | 24-October-2021 |
| European Open | 18-October-2021 | 24-October-2021 |
| Vienna Open | 25-October-2021 | 31-October-2021 |
| Swiss Indoors | 25-October-2021 | 31-October-2021 |
| Paris Masters | 1-November-2021 | 7-November-2021 |
| Next Gen ATP Finals | 9-November-2021 | 13-November-2021 |
| ATP Finals | 14-November-2021 | 21-November-2021 |
| Davis Cup Finals | 22-November-2021 | 28-November-2021 |
| Tournaments | Start Date | End Date |
| Abu Dhabi Women's Tennis Open 2021 | 6-January-2021 | 13-January-2021 |
| Melbourne 1 | 31-January-2021 | 6-February-2021 |
| Melbourne 2 | 31-January-2021 | 6-February-2021 |
| Australian Open | 8-February-2021 | 21-February-2021 |
*Bold represents Grand Slams / Tennis Majors
