Head to Head
| 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 |
| World Championship 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 |
Home History
| Gibraltar Open 2022 | 2022/03/25 10:35 | Ronnie O'Sullivan v Ben Woollaston | 3-4 |
| Welsh Open 2022 | 2022/03/03 20:40 | Ronnie O'Sullivan v Ricky Walden | 3-4 |
| Welsh Open 2022 | 2022/03/03 13:05 | Ronnie O'Sullivan v Ding Junhui | 4-2 |
| Welsh Open 2022 | 2022/03/02 13:05 | Ronnie O'Sullivan v Lukas Kleckers | 4-2 |
| Welsh Open Qualifiers 2022 | 2022/03/01 13:05 | Ronnie O'Sullivan v James Cahill | 4-0 |
| European Masters 2022 | 2022/02/27 13:00 | Fan Zhengyi v Ronnie O'Sullivan | 10-9 |
| European Masters 2022 | 2022/02/26 19:00 | Ronnie O'Sullivan v Liang Wenbo | 6-2 |
| European Masters 2022 | 2022/02/25 19:00 | Ronnie O'Sullivan v Tom Ford | 5-1 |
Away History
| Turkish Masters 2022 | 2022/03/09 08:00 | Mark Williams v Matthew Stevens | 3-5 |
| Welsh Open 2022 | 2022/03/01 14:15 | Mark Williams v Kurt Maflin | 3-4 |
| Welsh Open Qualifiers 2022 | 2022/02/28 15:10 | Mark Williams v Michael Judge | 4-1 |
| Players Championship 2022 | 2022/02/09 19:00 | Ricky Walden v Mark Williams | 6-5 |
| Players Championship 2022 | 2022/02/07 19:00 | Mark Williams v Gary Wilson | 6-3 |
| Turkish Masters Qualifiers 2022 | 2022/02/04 19:00 | Mark Williams v Reanne Evans | 5-1 |
| German Masters 2022 | 2022/01/26 14:00 | Zhao Xintong v Mark Williams | 5-3 |
| Snooker Shoot-Out 2022 | 2022/01/23 22:40 | Mark Williams v Hossein Vafaei | 0-1 |