Head to Head
| Tour Championship 2022 | 2022/03/30 12:00 | Ronnie O'Sullivan v Mark Williams | 10-9 |
| Welsh Open 2021 | 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 |
| Mistrzostwa Świata 2020 | 2020/08/11 18:00 | Mark Williams v Ronnie O'Sullivan | 10-13 |
| Gibraltar Open 2019 | 2017/11/16 11:30 | Ronnie O'Sullivan v Mark Williams | 5-1 |
| Gibraltar Open 2019 | 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 |
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