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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 |
| Murray River Open (Melbourne) | 1-February-2021 | 7-February-2021 |
| Great Ocean Road Open (Melbourne) | 1-February-2021 | 7-February-2021 |
| ATP Cup | 2-February-2021 | 6-February-2021 |
| Australian Open | 8-February-2021 | 21-February-2021 |
| Cordoba Open | 22-February-2021 | 28-February-2021 |
| Open Sud de France (Montpellier) | 22-February-2021 | 28-February-2021 |
| Singapore Tennis Open 2021 | 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 (Marseille) | 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 |
| AnyTech365 Andalucia Open (Marbella) | 5-April-2021 | 11-April-2021 |
| Sardegna Open (Cagliari) | 5-April-2021 | 11-April-2021 |
| Monte-Carlo Masters | 11-April-2021 | 18-April-2021 |
| Barcelona Open | 19-April-2021 | 25-April-2021 |
| Serbia Open | 19-April-2021 | 25-April-2021 |
| Estoril Open | 26-April-2021 | 2-May-2021 |
| Bavarian International Tennis Championships (Munich) | 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 |
| Belgrade 2 | 22-May-2021 | 29-May-2021 |
| Parma | 22-May-2021 | 29-May-2021 |
| French Open | 30-May-2021 | 12-June-2021 |
| Mercedes Cup (Stuttgart) | 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 (Eastbourne) | 20-June-2021 | 26-June-2021 |
| Wimbledon | 28-June-2021 | 11-July-2021 |
| German Open (Hamburg) | 12-July-2021 | 18-July-2021 |
| Hall of Fame Open (Newport) | 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 (Umag) | 19-July-2021 | 25-July-2021 |
| Swiss Open (Gstaad) | 19-July-2021 | 25-July-2021 |
| Tokyo Olympics 2021 | 24-July-2021 | 30-July-2021 |
| Austrian Open Kitzbühel | 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 (Metz) | 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 (Moscow) | 18-October-2021 | 24-October-2021 |
| Stockholm Open | 18-October-2021 | 24-October-2021 |
| European Open (Antwerp) | 18-October-2021 | 24-October-2021 |
| Vienna Open | 25-October-2021 | 31-October-2021 |
| Swiss Indoors (Basel) | 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 |
| Gippsland Trophy (Melbourne) | 31-January-2021 | 6-February-2021 |
| Yarra Valley Classic (Melbourne) | 31-January-2021 | 6-February-2021 |
| Grampians Trophy (Melbourne) | 3-February-2021 | 7-February-2021 |
| Australian Open | 8-February-2021 | 21-February-2021 |
| Phillip Island Trophy (Melbourne) | 13-February-2021 | 19-February-2021 |
| Adelaide International WTA 500 | 21-February-2021 | 27-February-2021 |
| Qatar Total Open | 1-March-2021 | 6-March-2021 |
| Open 6eme Sens Metropole De Lyon | 1-March-2021 | 7-March-2021 |
| Dubai Tennis Championships | 7-March-2021 | 13-March-2021 |
| Abierto De Guadalajara | 8-March-2021 | 14-March-2021 |
| Abierto GNP Seguros (Monterrey) | 15-March-2021 | 21-March-2021 |
| St. Petersburg Ladies Trophy | 15-March-2021 | 21-March-2021 |
| Miami Open | 24-March-2021 | 4-April-2021 |
| Volvo Car Open (Charleston) | 5-April-2021 | 11-April-2021 |
| Copa Colsanitas (Bogota) | 5-April-2021 | 11-April-2021 |
| Kunming Open (Anning) | 12-April-2021 | 18-April-2021 |
| WTA 250 Charleston | 12-April-2021 | 18-April-2021 |
| Porsche Tennis Grand Prix (Stuttgart) | 19-April-2021 | 25-April-2021 |
| Tennis Championship Istanbul | 19-April-2021 | 25-April-2021 |
| Madrid Open | 29-April-2021 | 8-May-2021 |
| WTA 125 Saint-Malo | 3-May-2021 | 9-May-2021 |
| Italian Open | 10-May-2021 | 16-May-2021 |
| Belgrade WTA 250 | 16-May-2021 | 22-May-2021 |
| Internationaux de Strasbourg | 23-May-2021 | 29-May-2021 |
| French Open | 30-May-2021 | 12-June-2021 |
| Nottingham Open | 7-June-2021 | 13-June-2021 |
| WTA 125 Bol | 8-June-2021 | 13-June-2021 |
| Birmingham Classic | 14-June-2021 | 20-June-2021 |
| Bett10 Open (Berlin) | 14-June-2021 | 20-June-2021 |
| Eastbourne International | 21-June-2021 | 27-June-2021 |
| Bad Homburg Open | 21-June-2021 | 27-June-2021 |
| Wimbledon | 28-June-2021 | 11-July-2021 |
| Nordea Open (Bastad) | 5-July-2021 | 11-July-2021 |
| Hungarian Grand Prix | 12-July-2021 | 18-July-2021 |
| Livesport Prague Open | 12-July-2021 | 18-July-2021 |
| Ladies Open Lausanne | 12-July-2021 | 18-July-2021 |
| WTA 250 Gdynia | 19-July-2021 | 25-July-2021 |
| Palermo Ladies Open | 19-July-2021 | 25-July-2021 |
| Tokyo Olympics 2021 | 24-July-2021 | 30-July-2021 |
| WTA 125 Belgrade | 26-July-2021 | 1-August-2021 |
| WTA 125 Charleston | 26-July-2021 | 1-August-2021 |
| Mubadala Silicon Valley Classic (San Jose) | 2-August-2021 | 8-August-2021 |
| National Bank Open (Montreal) | 9-August-2021 | 15-August-2021 |
| Western & Southern Open (Cincinnati) | 16-August-2021 | 22-August-2021 |
| WTA 125 Chicago | 16-August-2021 | 22-August-2021 |
| Cleveland WTA 250 | 23-August-2021 | 29-August-2021 |
| US Open | 30-August-2021 | 13-September-2021 |
| WTA 125 Karlsruhe | 6-September-2021 | 12-September-2021 |
*Bold represents Grand Slams / Tennis Majors
