| Result | Tournament |
|---|---|
| Robert Milkins defeated Michael O'Sullivan | 1998 World Championship Snooker |
| Michael O'Sullivan defeated Matt Wilson | 1998 World Championship Snooker |
| Michael O'Sullivan defeated Jack Fitzmaurice | 1998 World Championship Snooker |
| Sean Lanigan defeated Michael O'Sullivan | 1998 UK Tour - Event 5 Snooker |
| Michael O'Sullivan defeated Munraj Pal | 1998 UK Tour - Event 5 Snooker |
| Oliver King defeated Michael O'Sullivan | 1998 UK Tour - Event 4 Snooker |
| Michael O'Sullivan defeated Alex Borg | 1998 UK Tour - Event 4 Snooker |
| Michael O'Sullivan defeated Wayne Rendle | 1998 UK Tour - Event 4 Snooker |
| Martin O'Neill defeated Michael O'Sullivan | 1998 UK Tour - Event 3 Snooker |
| Michael O'Sullivan defeated Steve Russell | 1998 UK Tour - Event 3 Snooker |
| Garry Baldrey defeated Michael O'Sullivan | 1998 UK Tour - Event 2 Snooker |
| Mark Fenton defeated Michael O'Sullivan | 1998 UK Tour - Event 1 Snooker |
| Michael O'Sullivan defeated Patrick Delsemme | 1998 UK Tour - Event 1 Snooker |
| Matthew Street defeated Michael O'Sullivan | 1998 Benson and Hedges Championship Snooker |
| Tai Pichit defeated Michael O'Sullivan | 1997 World Championship Snooker |
| Michael O'Sullivan defeated James Tatton | 1997 World Championship Snooker |
| Mark Fenton defeated Michael O'Sullivan | 1997 Welsh Open Snooker |
| Michael O'Sullivan defeated David Craggs | 1997 Welsh Open Snooker |
| Steve Russell defeated Michael O'Sullivan | 1997 Thailand Open Snooker |
| Michael O'Sullivan defeated Paul Radin | 1997 Thailand Open Snooker |
| Barry Mapstone defeated Michael O'Sullivan | 1997 International Open Snooker |
| Sean Lanigan defeated Michael O'Sullivan | 1997 European Open Snooker |
| Michael O'Sullivan defeated Darren Hackeson | 1997 European Open Snooker |
| Michael O'Sullivan defeated Andrew Photiou | 1997 European Open Snooker |
| Nick Manning defeated Michael O'Sullivan | 1997 British Open Snooker |
| Sean Lanigan defeated Michael O'Sullivan | 1997 Benson and Hedges Championship Snooker |
| Michael O'Sullivan defeated Jason Curtis | 1997 Benson and Hedges Championship Snooker |
| David Coles defeated Michael O'Sullivan | 1996 World Championship Snooker |
| Michael O'Sullivan defeated Jason Smith | 1996 World Championship Snooker |
| Michael O'Sullivan defeated Sanjay Meghani | 1996 World Championship Snooker |
| Suriya Suwannasingh defeated Michael O'Sullivan | 1996 Welsh Open Snooker |
| Michael O'Sullivan defeated Martin Dziewialtowski | 1996 Welsh Open Snooker |
| Michael O'Sullivan defeated Juan Rosales | 1996 Welsh Open Snooker |
| Patrick Wallace defeated Michael O'Sullivan | 1996 UK Championship Snooker |
| Michael O'Sullivan defeated Steve Day | 1996 UK Championship Snooker |
| Colin Donaldson defeated Michael O'Sullivan | 1996 Thailand Open Snooker |
| David Thompson defeated Michael O'Sullivan | 1996 International Open Snooker |
| Sanjay Meghani defeated Michael O'Sullivan | 1996 Grand Prix Snooker |
| Matthew Street defeated Michael O'Sullivan | 1996 German Open Snooker |
| Robert Milkins defeated Michael O'Sullivan | 1996 European Open Snooker |
| Mark Fenton defeated Michael O'Sullivan | 1996 British Open Snooker |
| Michael O'Sullivan defeated Paul Lovegrove | 1996 British Open Snooker |
| Paul McPhillips defeated Michael O'Sullivan | 1996 Benson and Hedges Championship Snooker |
| Chris Shade defeated Michael O'Sullivan | 1996 Asian Classic Snooker |
| Michael O'Sullivan defeated Paul Radin | 1996 Asian Classic Snooker |
| Paul Davison (II) defeated Michael O'Sullivan | 1995 World Championship Snooker |
| Gary Ponting defeated Michael O'Sullivan | 1995 Welsh Open Snooker |
| Michael O'Sullivan defeated Tony Brown | 1995 Welsh Open Snooker |
| Paul Radin defeated Michael O'Sullivan | 1995 UK Championship Snooker |
| Leo Fernandez defeated Michael O'Sullivan | 1995 Thailand Classic Snooker |