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 |
| Gibraltar Open 2019 | 2017/01/05 10:50 | Mark Williams v Ryan Day | 1-3 |
| World Grand Prix | 2015/03/17 18:50 | Mark Williams v Ryan Day | 4-3 |