| Result | Tournament |
|---|---|
| Allan Williams defeated Bill Hogg | 2016 Derby City Classic 9-Ball |
| Dan Louie defeated Allan Williams | 2016 Derby City Classic 9-Ball |
| Yuri Kismereshkin defeated Allan Williams | 2016 Derby City Classic 9-Ball |
| Bernie Pettipiece defeated Allan Williams | 2014 Derby City Classic One Pocket |
| Allan Williams defeated Scott Howard | 2014 Derby City Classic Bank Pool |
| Jerry Matchin defeated Allan Williams | 2014 Derby City Classic Bank Pool |
| Allan Williams defeated Brandon Cook | 2014 Derby City Classic Bank Pool |
| Gus Briseno defeated Allan Williams | 2014 Derby City Classic Bank Pool |
| Adam Wheeler defeated Allan Williams | 2014 Derby City Classic 9-Ball |
| Allan Williams defeated Marshall Wooten | 2014 Derby City Classic 9-Ball |
| Allan Williams defeated Julie Kelly | 2014 Derby City Classic 9-Ball |
| Warren Kiamco defeated Allan Williams | 2014 Derby City Classic 9-Ball |
| Andrew Hall defeated Allan Williams | 1998 UK Tour - Event 1 Snooker |
| Allan Williams defeated Rogelio Esteiro | 1998 UK Tour - Event 1 Snooker |
| Evan Munro defeated Allan Williams | 1997 World Championship Snooker |
| Allan Williams defeated Ewan Hunter | 1997 World Championship Snooker |
| Timothy Paling defeated Allan Williams | 1997 Welsh Open Snooker |
| Kyndon Paddon defeated Allan Williams | 1997 Thailand Open Snooker |
| Jon Wibberley defeated Allan Williams | 1997 International Open Snooker |
| Shaun Wilkes defeated Allan Williams | 1997 European Open Snooker |
| Grant Conquest defeated Allan Williams | 1997 British Open Snooker |
| John Wilson defeated Allan Williams | 1996 UK Championship Snooker |
| Johl Younger defeated Allan Williams | 1996 Grand Prix Snooker |
| Nick Spelman defeated Allan Williams | 1996 German Open Snooker |
| Jason Prince defeated Allan Williams | 1996 Benson and Hedges Championship Snooker |
| Andrew Higginson defeated Allan Williams | 1996 Asian Classic Snooker |