| Result | Tournament |
|---|---|
| Matt Wilson defeated Martin O'Neill | 1999 World Championship Snooker |
| Nick Manning defeated Martin O'Neill | 1998 World Championship Snooker |
| Colm Gilcreest defeated Martin O'Neill | 1998 UK Tour - Event 5 Snooker |
| Mark Miller defeated Martin O'Neill | 1998 UK Tour - Event 4 Snooker |
| Graham Horne defeated Martin O'Neill | 1998 UK Tour - Event 3 Snooker |
| Martin O'Neill defeated Michael O'Sullivan | 1998 UK Tour - Event 3 Snooker |
| Wayne Saidler defeated Martin O'Neill | 1998 UK Tour - Event 2 Snooker |
| Neal Jones defeated Martin O'Neill | 1998 UK Tour - Event 1 Snooker |
| Antony Bolsover defeated Martin O'Neill | 1997 World Championship Snooker |
| Martin O'Neill defeated Mark Rowing | 1997 World Championship Snooker |
| Martin O'Neill defeated Barry Hawkins | 1997 World Championship Snooker |
| Ian McCulloch defeated Martin O'Neill | 1997 Welsh Open Snooker |
| Martin O'Neill defeated Paul Cavney | 1997 Welsh Open Snooker |
| Martin O'Neill defeated Will Jerram | 1997 Welsh Open Snooker |
| Lee Walker defeated Martin O'Neill | 1997 Thailand Open Snooker |
| Martin O'Neill defeated David McLellan | 1997 Thailand Open Snooker |
| Martin O'Neill defeated Andrew Radford | 1997 Thailand Open Snooker |
| Lee Richardson defeated Martin O'Neill | 1997 Qualifying School - Event 4 Snooker |
| Martin O'Neill defeated Declan Hughes | 1997 Qualifying School - Event 4 Snooker |
| Ian Hurdman defeated Martin O'Neill | 1997 Qualifying School - Event 3 Snooker |
| Alan Burnett defeated Martin O'Neill | 1997 Qualifying School - Event 2 Snooker |
| Martin O'Neill defeated Wayne Saidler | 1997 Qualifying School - Event 2 Snooker |
| Declan Hughes defeated Martin O'Neill | 1997 Qualifying School - Event 1 Snooker |
| Wayne Saidler defeated Martin O'Neill | 1997 International Open Snooker |
| Rory McLeod defeated Martin O'Neill | 1997 European Open Snooker |
| Chris Scanlon defeated Martin O'Neill | 1997 British Open Snooker |
| Martin O'Neill defeated James Vicarey | 1997 British Open Snooker |
| Stephen Lee defeated Martin O'Neill | 1996 World Championship Snooker |
| Martin O'Neill defeated Oliver King | 1996 World Championship Snooker |
| Martin O'Neill defeated Stuart Reardon | 1996 World Championship Snooker |
| Martin O'Neill defeated Eddie Manning | 1996 World Championship Snooker |
| Tom Finstad defeated Martin O'Neill | 1996 Welsh Open Snooker |
| Paul Hunter defeated Martin O'Neill | 1996 UK Championship Snooker |
| Martin O'Neill defeated Johl Younger | 1996 UK Championship Snooker |
| Tony Meo defeated Martin O'Neill | 1996 Thailand Open Snooker |
| Martin O'Neill defeated Steve Harrison | 1996 Thailand Open Snooker |
| Darren Clarke defeated Martin O'Neill | 1996 International Open Snooker |
| Martin O'Neill defeated John Manley | 1996 International Open Snooker |
| Paul Davies defeated Martin O'Neill | 1996 Grand Prix Snooker |
| Martin O'Neill defeated Simon Parker | 1996 Grand Prix Snooker |
| Martin O'Neill defeated Sean Lanigan | 1996 Grand Prix Snooker |
| Martin O'Neill defeated Daniele Zagaroli | 1996 Grand Prix Snooker |
| Matthew Bray defeated Martin O'Neill | 1996 German Open Snooker |
| Martin O'Neill defeated Andrew Cairns | 1996 German Open Snooker |
| Martin O'Neill defeated Karl Beare | 1996 German Open Snooker |
| Alistair Fleming defeated Martin O'Neill | 1996 European Open Snooker |
| Sean Lanigan defeated Martin O'Neill | 1996 British Open Snooker |
| Martin O'Neill defeated Neil Selman | 1996 British Open Snooker |
| Drew Henry defeated Martin O'Neill | 1996 Benson and Hedges Championship Snooker |
| Martin O'Neill defeated John Lardner | 1996 Benson and Hedges Championship Snooker |