| Southern hemisphere – Rugby Championship (Match 6) | 2021 | | 2 October |
| Southern hemisphere – Rugby Championship | 2021 |  | 14 August–2 October |
| Southern hemisphere – Freedom Cup (Match 2) | 2021 | | 2 October |
| Southern hemisphere – Freedom Cup | 2021 | | 25 September–2 October |
| Southern hemisphere – Rugby Championship (Match 6) | 2021 | | 2 October |
| Formula 1 – Grand Prix – Russian Grand Prix | 2021 | | 26 September |
| European League of Football – Championships – Championship Game | 2021 | | 26 September |
| Others – Ryder Cup | 2021 | | 24–26 September |
| Honbasho – Aki Basho (September) | 2021 | | 12–26 September |
| World Championships – Men – Road race | 2021 | | 26 September |
| World Marathon Majors – Berlin Marathon – Men | 2021 | | 26 September |
| World Marathon Majors – Berlin Marathon – Women | 2021 | | 26 September |
| World Championships – Women – Road race | 2021 | | 25 September |
| Ultimate Fighting Championship – Women – Flyweight | 2021 | | 25 September |
| Ultimate Fighting Championship – Men – Featherweight | 2021 | | 25 September |
| World Championship – Men – Heavyweight | 2021 | | 25 September |
| Southern hemisphere – Rugby Championship (Match 5) | 2021 | | 25 September |
| Southern hemisphere – Rugby Championship (Match 5) | 2021 | | 25 September |
| Southern hemisphere – Freedom Cup (Match 1) | 2021 | | 25 September |
| World Championships – Women – Time trial | 2021 | | 20 September |
| Europe Top-16 – Men | 2021 | | 18–19 September |
| World Championships – Men – Time trial | 2021 | | 19 September |
| Continental championships – Europe – Men | 2021 | | 1–19 September |
| Europe Top-16 – Women | 2021 | | 18–19 September |
| Southern hemisphere – Rugby Championship (Match 4) | 2021 | | 18 September |
| Southern hemisphere – Rugby Championship (Match 4) | 2021 | | 18 September |
| Southern hemisphere – Rugby Championship (Match 3) | 2021 | | 12 September |
| Formula 1 – Grand Prix – Italian Grand Prix | 2021 | | 12 September |
| World Rally Championship (WRC) – Rallies – Rally Greece (Acropolis) | 2021 | | 9–12 September |
| ATP Tour – Grand Slam – US Open | 2021 | | 30 August–12 September |
| Southern hemisphere – Rugby Championship (Match 3) | 2021 | | 12 September |
| ATP Tour – Grand Slam – US Open (Final) | 2021 | | 12 September |
| WTA Tour – Grand Slam – US Open (Final) | 2021 | | 11 September |
| WTA Tour – Grand Slam – US Open | 2021 | | 30 August–11 September |
| ATP Tour – Grand Slam – US Open (Semifinal #2) | 2021 | | 10 September |
| ATP Tour – Grand Slam – US Open (Semifinal #1) | 2021 | | 10 September |
| WTA Tour – Grand Slam – US Open (Semifinal #2) | 2021 | | 9 September |
| Diamond League – Men – 100 m | 2021 | | 9 September |
| Diamond League – Men – 200 m | 2021 | | 9 September |
| Diamond League – Men – 400 m | 2021 | | 9 September |
| Diamond League – Men – 800 m | 2021 | | 9 September |
| Diamond League – Men – 1500 m | 2021 | | 9 September |
| Diamond League – Men – 110 m hurdles | 2021 | | 9 September |
| Diamond League – Men – 400 m hurdles | 2021 | | 9 September |
| Diamond League – Men – 3000 m steeple | 2021 | | 9 September |
| Diamond League – Men – High jump | 2021 | | 9 September |
| Diamond League – Men – Pole vault | 2021 | | 9 September |
| Diamond League – Men – Triple jump | 2021 | | 9 September |
| Diamond League – Men – Discus throw | 2021 | | 9 September |
| Diamond League – Men – Javelin throw | 2021 | | 9 September |
| Diamond League – Women – 100 m | 2021 | | 9 September |
| Diamond League – Women – 200 m | 2021 | | 9 September |
| Diamond League – Women – 400 m | 2021 | | 9 September |
| Diamond League – Women – 800 m | 2021 | | 9 September |
| Diamond League – Women – 1500 m | 2021 | | 9 September |
| Diamond League – Women – 100 m hurdles | 2021 | | 9 September |
| Diamond League – Women – 400 m hurdles | 2021 | | 9 September |
| Diamond League – Women – 3000 m steeple | 2021 | | 9 September |
| Diamond League – Women – Pole vault | 2021 | | 9 September |
| Diamond League – Women – Triple jump | 2021 | | 9 September |
| Diamond League – Women – Discus throw | 2021 | | 9 September |
| Diamond League – Women – Javelin throw | 2021 | | 9 September |
| WTA Tour – Grand Slam – US Open (Semifinal #1) | 2021 | | 9 September |
| Diamond League – Women – 5000 m | 2021 | | 8 September |
| ATP Tour – Grand Slam – US Open (Quarterfinal #1) | 2021 | | 8 September |
| ATP Tour – Grand Slam – US Open (Quarterfinal #2) | 2021 | | 8 September |
| ATP Tour – Grand Slam – US Open (Quarterfinal #3) | 2021 | | 8 September |
| ATP Tour – Grand Slam – US Open (Quarterfinal #4) | 2021 | | 8 September |
| Diamond League – Women – Shot put | 2021 | | 8 September |
| Diamond League – Women – Long jump | 2021 | | 8 September |
| Diamond League – Women – High jump | 2021 | | 8 September |
| Diamond League – Men – 5000 m | 2021 | | 8 September |
| Diamond League – Men – Long jump | 2021 | | 8 September |
| Diamond League – Men – Shot put | 2021 | | 8 September |
| WTA Tour – Grand Slam – US Open (Quarterfinal #2) | 2021 | | 7 September |
| WTA Tour – Grand Slam – US Open (Quarterfinal #3) | 2021 | | 7 September |
| WTA Tour – Grand Slam – US Open (Quarterfinal #4) | 2021 | | 7 September |
| WTA Tour – Grand Slam – US Open (Quarterfinal #1) | 2021 | | 7 September |
| Southern hemisphere – Bledisloe Cup (Match 3) | 2021 | | 5 September |
| Southern hemisphere – Bledisloe Cup | 2021 | | 7 August–5 September |
| UCI World Tour – Vuelta a España – General standings | 2021 | | 14 August–5 September |
| Southern hemisphere – Rugby Championship (Match 2) | 2021 | | 5 September |
| Formula 1 – Grand Prix – Dutch Grand Prix | 2021 | | 5 September |
| Formula 1 – Grand Prix – Belgian Grand Prix | 2021 | | 29 August |
| World Cup – Men – Results | 2021 | | 19–29 August |
| Ultra-Trail du Mont-Blanc – Men | 2021 | | 28 August |
| Ultra-Trail du Mont-Blanc – Women | 2021 | | 28 August |
| 24 hours of Le Mans – Drivers | 2021 | | 21–22 August |
| ATP Tour – ATP Masters 1000 – Cincinnati | 2021 | | 15–22 August |
| Southern hemisphere – Rugby Championship (Match 2) | 2021 | | 21 August |
| World Championships – Men – Standard | 2022 | | 20 August |
| World Rally Championship (WRC) – Rallies – Rally Belgium (Ypres) | 2021 | | 13–15 August |
| ATP Tour – ATP Masters 1000 – Montreal/Toronto | 2021 | | 6–15 August |
| Southern hemisphere – Rugby Championship (Match 1) | 2021 | | 14 August |
| Southern hemisphere – Bledisloe Cup (Match 2) | 2021 | | 14 August |
| Southern hemisphere – Rugby Championship (Match 1) | 2021 | | 14 August |
Past events
