| Southern hemisphere – Rugby Championship (Round 6) | 2018 | | 6 October |
| Ultimate Fighting Championship – Men – Lightweight | 2018 |  | 6 October |
| Southern hemisphere – Rugby Championship (Round 6) | 2018 | | 6 October |
| Southern hemisphere – Rugby Championship | 2018 | | 18 August–6 October |
| Southern hemisphere – Freedom Cup | 2018 | | 15 September–6 October |
| Southern hemisphere – Freedom Cup (Match 2) | 2018 | | 6 October |
| MLB – Championships – World Series (AL Wild Card Game) | 2018 | | 3 October |
| MLB – Championships – World Series (NL Wild Card Game) | 2018 | | 2 October |
| World Championships – Men | 2018 | | 9–30 September |
| World Cup – Women | 2018 | | 28–30 September |
| Others – Ryder Cup | 2018 | | 28–30 September |
| World Championships – Men – Road race | 2018 | | 30 September |
| Formula 1 – Grand Prix – Russian Grand Prix | 2018 | | 30 September |
| Southern hemisphere – Rugby Championship (Round 5) | 2018 | | 29 September |
| World Championships – Women – Road race | 2018 | | 29 September |
| Southern hemisphere – Rugby Championship (Round 5) | 2018 | | 29 September |
| World Championships – Men – Time trial | 2018 | | 26 September |
| World Championships – Women – Time trial | 2018 | | 25 September |
| Honbasho – Aki Basho (September) | 2018 | | 9–23 September |
| World Championship – Men – Heavyweight | 2018 | | 22 September |
| World Championships – Men – Single sculls | 2018 | | 16 September |
| World Marathon Majors – Berlin Marathon – Men | 2018 | | 16 September |
| World Marathon Majors – Berlin Marathon – Women | 2018 | | 16 September |
| World Rally Championship (WRC) – Rallies – Rally Turkey | 2018 | | 13–16 September |
| UCI World Tour – Vuelta a España – General standings | 2018 | | 25 August–16 September |
| Formula 1 – Grand Prix – Singapore Grand Prix | 2018 | | 16 September |
| Southern hemisphere – Freedom Cup (Match 1) | 2018 | | 15 September |
| Southern hemisphere – Rugby Championship (Round 4) | 2018 | | 15 September |
| Southern hemisphere – Rugby Championship (Round 4) | 2018 | | 15 September |
| ATP Tour – Grand Slam – US Open | 2018 | | 27 August–9 September |
| ATP Tour – Grand Slam – US Open (Final) | 2018 | | 9 September |
| Southern hemisphere – Rugby Championship (Round 3) | 2018 | | 8 September |
| Southern hemisphere – Rugby Championship (Round 3) | 2018 | | 8 September |
| WTA Tour – Grand Slam – US Open | 2018 | | 27 August–8 September |
| WTA Tour – Grand Slam – US Open (Final) | 2018 | | 8 September |
| Ultimate Fighting Championship – Men – Welterweight | 2018 | | 8 September |
| ATP Tour – Grand Slam – US Open (Semifinal #1) | 2018 | | 7 September |
| ATP Tour – Grand Slam – US Open (Semifinal #2) | 2018 | | 7 September |
| WTA Tour – Grand Slam – US Open (Semifinal #1) | 2018 | | 6 September |
| WTA Tour – Grand Slam – US Open (Semifinal #2) | 2018 | | 6 September |
| ATP Tour – Grand Slam – US Open (Quarterfinal #1) | 2018 | | 0–6 6–4 7–5 6–7(4) 7–6(5) | | |
| 5 September |
| ATP Tour – Grand Slam – US Open (Quarterfinal #2) | 2018 | | 5 September |
| ATP Tour – Grand Slam – US Open (Quarterfinal #3) | 2018 | | 5 September |
| ATP Tour – Grand Slam – US Open (Quarterfinal #4) | 2018 | | 5 September |
| WTA Tour – Grand Slam – US Open (Quarterfinal #2) | 2018 | | 4 September |
| WTA Tour – Grand Slam – US Open (Quarterfinal #1) | 2018 | | 4 September |
| WTA Tour – Grand Slam – US Open (Quarterfinal #4) | 2018 | | 4 September |
| WTA Tour – Grand Slam – US Open (Quarterfinal #3) | 2018 | | 4 September |
| Formula 1 – Grand Prix – Italian Grand Prix | 2018 | | 2 September |
| Diamond League – Women – 400 m | 2018 | | 31 August |
| Diamond League – Women – 200 m | 2018 | | 31 August |
| Diamond League – Men – Triple jump | 2018 | | 31 August |
| Diamond League – Men – Pole vault | 2018 | | 31 August |
| Diamond League – Men – High jump | 2018 | | 31 August |
| Diamond League – Men – 5000 m | 2018 | | 31 August |
| Diamond League – Women – Long jump | 2018 | | 31 August |
| Diamond League – Women – Discus throw | 2018 | | 31 August |
| Ultra-Trail du Mont-Blanc – Men | 2018 | | 31 August |
| Ultra-Trail du Mont-Blanc – Women | 2018 | | 31 August |
| Diamond League – Women – Shot put | 2018 | | 31 August |
| Diamond League – Men – 800 m | 2018 | | 31 August |
| Diamond League – Men – Discus throw | 2018 | | 31 August |
| Diamond League – Women – 100 m hurdles | 2018 | | 31 August |
| Diamond League – Men – 110 m hurdles | 2018 | | 31 August |
| Diamond League – Men – 100 m | 2018 | | 31 August |
| Diamond League – Women – 3000 m steeple | 2018 | | 31 August |
| Diamond League – Women – 1500 m | 2018 | | 31 August |
| Diamond League – Men – 200 m | 2018 | | 30 August |
| Diamond League – Men – 1500 m | 2018 | | 30 August |
| Diamond League – Men – 3000 m steeple | 2018 | | 30 August |
| Diamond League – Men – 400 m hurdles | 2018 | | 30 August |
| Diamond League – Men – Long jump | 2018 | | 30 August |
| Diamond League – Men – Javelin throw | 2018 | | 30 August |
| Diamond League – Women – 100 m | 2018 | | 30 August |
| Diamond League – Women – 5000 m | 2018 | | 30 August |
| Diamond League – Women – 400 m hurdles | 2018 | | 30 August |
| Diamond League – Women – High jump | 2018 | | 30 August |
| Diamond League – Women – Pole vault | 2018 | | 30 August |
| Diamond League – Women – Triple jump | 2018 | | 30 August |
| Diamond League – Women – Javelin throw | 2018 | | 30 August |
| Diamond League – Men – Shot put | 2018 | | 30 August |
| Diamond League – Women – 800 m | 2018 | | 30 August |
| Diamond League – Men – 400 m | 2018 | | 30 August |
| World Championships – Men | 2018 | | 18–26 August |
| Formula 1 – Grand Prix – Belgian Grand Prix | 2018 | | 26 August |
| Southern hemisphere – Rugby Championship (Round 2) | 2018 | | 25 August |
| Southern hemisphere – Rugby Championship (Round 2) | 2018 | | 25 August |
| Southern hemisphere – Bledisloe Cup (Match 2) | 2018 | | 25 August |
| UCI World Tour – Hamburg Cyclassics | 2018 | | 19 August |
| World Rally Championship (WRC) – Rallies – Rally Germany | 2018 | | 16–19 August |
| ATP Tour – ATP Masters 1000 – Cincinnati | 2018 | | 13–19 August |
| Southern hemisphere – Bledisloe Cup (Match 1) | 2018 | | 18 August |
| Southern hemisphere – Rugby Championship (Round 1) | 2018 | | 18 August |
| Southern hemisphere – Rugby Championship (Round 1) | 2018 | | 18 August |
Past events
