| Result | Tournament |
|---|---|
| John Whitty defeated Ian Williamson | 1996 World Championship Snooker |
| Lee Mallen defeated Ian Williamson | 1996 British Open Snooker |
| Oliver King defeated Ian Williamson | 1995 World Championship Snooker |
| Ian Williamson defeated Carl Waters | 1995 World Championship Snooker |
| Ian Williamson defeated Anthony Buckley | 1995 World Championship Snooker |
| Tom Finstad defeated Ian Williamson | 1995 Grand Prix Snooker |
| Ian Williamson defeated Mark Love | 1995 Grand Prix Snooker |
| Warren King defeated Ian Williamson | 1994 World Championship Snooker |
| Ian Williamson defeated Chris Scanlon | 1994 World Championship Snooker |
| Jamie Burnett defeated Ian Williamson | 1994 Welsh Open Snooker |
| Richy McDonald defeated Ian Williamson | 1994 UK Championship Snooker |
| Ian Williamson defeated Jack Fitzmaurice | 1994 UK Championship Snooker |
| Paul Watchorn defeated Ian Williamson | 1994 Thailand Open Snooker |
| Roger Leighton defeated Ian Williamson | 1994 International Open Snooker |
| Neil Mosley defeated Ian Williamson | 1994 British Open Snooker |
| Ian Williamson defeated Robby Foldvari | 1994 British Open Snooker |
| Ian Williamson defeated Michael Duffy | 1994 British Open Snooker |
| Stephen O'Connor defeated Ian Williamson | 1993 World Championship Snooker |
| Steve Lemmens defeated Ian Williamson | 1993 Welsh Open Snooker |
| Steve Campbell defeated Ian Williamson | 1993 UK Championship Snooker |
| Ian Williamson defeated Dean Venables | 1993 UK Championship Snooker |
| Steve Mifsud defeated Ian Williamson | 1993 International Open Snooker |
| Sergio Beggiato defeated Ian Williamson | 1993 Grand Prix Snooker |
| Wayne Saidler defeated Ian Williamson | 1993 European Open Snooker |
| Jamie Woodman defeated Ian Williamson | 1993 European Open Snooker |
| Ian Williamson defeated Matt Gibson | 1993 European Open Snooker |
| Jamie Burnett defeated Ian Williamson | 1993 Dubai Classic Snooker |
| Jason Wallace defeated Ian Williamson | 1993 British Open Snooker |
| Oliver King defeated Ian Williamson | 1993 Asian Open Snooker |
| Jason Whittaker defeated Ian Williamson | 1992 World Championship Snooker |
| Ian Williamson defeated Fergal O'Brien | 1992 World Championship Snooker |
| Paul McPhillips defeated Ian Williamson | 1992 Welsh Open Snooker |
| Robert Foxall defeated Ian Williamson | 1992 UK Championship Snooker |
| Colin Morton defeated Ian Williamson | 1992 Strachan Open Snooker |
| Paul Morgan defeated Ian Williamson | 1992 Grand Prix Snooker |
| John Shilton defeated Ian Williamson | 1992 European Open Snooker |
| Peter Daubney defeated Ian Williamson | 1992 Dubai Classic Snooker |
| Ian Williamson defeated Cary Kikis | 1992 Dubai Classic Snooker |
| Jason Smith defeated Ian Williamson | 1992 Classic Snooker |
| Ian Williamson defeated Michael Kirkham | 1992 Classic Snooker |
| Joe Swail defeated Ian Williamson | 1992 British Open Snooker |
| Joe Swail defeated Ian Williamson | 1992 Benson and Hedges Championship Snooker |
| Ian Williamson defeated Mark Williams (II) | 1992 Benson and Hedges Championship Snooker |
| Jason Pegram defeated Ian Williamson | 1992 Asian Open Snooker |
| Paul Medati defeated Ian Williamson | 1991 World Championship Snooker |
| Paul Tanner defeated Ian Williamson | 1991 UK Championship Snooker |
| Kevin Young defeated Ian Williamson | 1991 Grand Prix Snooker |
| Craig Edwards defeated Ian Williamson | 1991 European Open Snooker |
| Ian Williamson defeated Dave Martin | 1991 European Open Snooker |
| Darren Morgan defeated Ian Williamson | 1991 Dubai Classic Snooker |