Head to Head
| UK Championship | 2017/12/04 13:10 | Mark Williams v Ryan Day | 5-6 |
| International Championship | 2017/10/31 11:30 | Ryan Day v Mark Williams | 2-6 |
| Gibraltar Open 2019 | 2017/08/18 11:30 | Ryan Day v Mark Williams | 0-5 |
| Riga Masters 2017 | 2017/06/25 12:55 | Ryan Day v Mark Williams | 5-4 |
| Championship League Snooker | 2017/02/22 15:20 | Mark Williams v Ryan Day | 3-2 |
| Championship League Snooker | 2017/02/20 17:50 | Mark Williams v Ryan Day | 2-3 |
| Championship League Snooker | 2017/01/11 13:55 | Mark Williams v Ryan Day | 3-1 |
| Gibraltar Open 2019 | 2017/01/09 19:55 | Ryan Day v Mark Williams | 2-3 |
Home History
| Welsh Open | 2018/02/26 15:30 | Ryan Day v Kurt Dunham | 2-4 |
| World Grand Prix | 2018/02/19 21:05 | Ryan Day v Jack Lisowski | 3-4 |
| Snooker Shoot-Out | 2018/02/09 17:25 | Michael Holt v Ryan Day | 1-0 |
| Gibraltar Open 2019 | 2018/02/02 19:00 | Ryan Day v Shaun Murphy | 4-5 |
| Gibraltar Open 2019 | 2018/02/02 13:00 | Mark Davis v Ryan Day | 4-5 |
| Gibraltar Open 2019 | 2018/02/01 14:00 | Ryan Day v Thepchaiya Un-Nooh | 5-1 |
| China Open | 2018/01/29 09:30 | Ryan Day v Lyu Haotian | 3-6 |
| The Masters | 2018/01/19 19:00 | John Higgins v Ryan Day | 6-1 |
Away History
| Welsh Open | 2018/02/28 18:45 | Aditya Mehta v Mark Williams | 3-4 |
| Welsh Open | 2018/02/27 13:05 | Mark Williams v Mark King | 4-2 |
| World Grand Prix | 2018/02/21 15:25 | Mark Williams v Stuart Bingham | 2-4 |
| Snooker Shoot-Out | 2018/02/11 19:25 | Joe Perry v Mark Williams | 1-0 |
| Snooker Shoot-Out | 2018/02/11 13:55 | Mark Williams v Allan Taylor | 1-0 |
| Snooker Shoot-Out | 2018/02/10 19:00 | James Wattana v Mark Williams | 0-1 |
| Snooker Shoot-Out | 2018/02/08 16:55 | Li Hang v Mark Williams | 0-1 |
| Gibraltar Open 2019 | 2018/02/04 13:00 | Mark Williams v Graeme Dott | 9-1 |