Head to Head
| 2023 The Masters | 2023/01/12 13:05 | Mark Williams v Ronnie O'Sullivan | 6-5 |
| 2022 Tour Championship | 2022/03/30 12:00 | Ronnie O'Sullivan v Mark Williams | 10-9 |
| 2021 Open de Gales | 2021/02/20 19:10 | Mark Williams v Ronnie O'Sullivan | 1-6 |
| Championship League Snooker | 2021/02/11 15:45 | Ronnie O'Sullivan v Mark Williams | 1-3 |
| 2020 Campeonato Mundial | 2020/08/11 18:00 | Mark Williams v Ronnie O'Sullivan | 10-13 |
| 2019 Gibraltar Open | 2017/11/16 11:30 | Ronnie O'Sullivan v Mark Williams | 5-1 |
| 2019 Gibraltar Open | 2016/12/02 19:00 | Mark Williams v Ronnie O'Sullivan | 2-6 |
| Championship League Snooker | 2016/01/04 12:00 | Ronnie O'Sullivan v Mark Williams | 3-2 |
Home History
| 2024 Tour Championship | 2024/04/06 12:00 | Mark Williams v Mark Allen | 10-5 |
| 2024 Tour Championship | 2024/04/04 12:00 | Judd Trump v Mark Williams | 4-10 |
| 2024 Tour Championship | 2024/04/02 18:00 | Mark Williams v Tom Ford | 10-9 |
| 2024 Campeonato do Mundo de Veteranos | 2024/03/04 21:25 | Mark Williams v John Higgins | 2-4 |
| 2024 Campeonato de Jogadores | 2024/02/20 13:00 | Mark Williams v Mark Allen | 3-6 |
| 2024 Open de Gales | 2024/02/14 19:00 | Anthony McGill v Mark Williams | 4-1 |
| 2024 Open de Gales | 2024/02/13 12:30 | Sanderson Lam v Mark Williams | 3-4 |
| 2024 Open do País de Gales - Qualificação | 2024/02/12 14:25 | Mark Williams v John J Astley | 4-2 |
Away History
| 2024 Tour Championship | 2024/04/05 12:00 | Gary Wilson v Ronnie O'Sullivan | 7-10 |
| 2024 Tour Championship | 2024/04/03 12:00 | Ronnie O'Sullivan v Ali Carter | 10-2 |
| 2024 Open Mundial | 2024/03/21 06:30 | Ronnie O'Sullivan v Hossein Vafaei | 4-5 |
| 2024 Open Mundial | 2024/03/20 11:30 | Ronnie O'Sullivan v Lyu Haotian | 5-2 |
| 2024 Open Mundial | 2024/03/19 11:30 | Ronnie O'Sullivan v Michael White | 5-3 |
| 2024 Campeonato do Mundo de Veteranos | 2024/03/06 20:00 | Luca Brecel v Ronnie O'Sullivan | 2-5 |
| 2024 Campeonato do Mundo de Veteranos | 2024/03/06 16:25 | Judd Trump v Ronnie O'Sullivan | 1-4 |
| 2024 Campeonato do Mundo de Veteranos | 2024/03/05 22:45 | Ronnie O'Sullivan v John Higgins | 4-0 |