| Result | Tournament |
|---|---|
| Steve Ventham defeated John Leahy | 2012 World Seniors Championship Snooker |
| William Milton defeated John Leahy | 1997 World Championship Snooker |
| Paddy Browne defeated John Leahy | 1995 World Championship Snooker |
| John Leahy defeated Graham Francis | 1995 World Championship Snooker |
| Joe Canny defeated John Leahy | 1994 World Championship Snooker |
| Matthew Stevens defeated John Leahy | 1994 UK Championship Snooker |
| Paul Sweeny defeated John Leahy | 1994 Grand Prix Snooker |
| Mark King defeated John Leahy | 1993 World Championship Snooker |
| John Leahy defeated Andrew Photiou | 1993 World Championship Snooker |
| David Coles defeated John Leahy | 1993 Welsh Open Snooker |
| John Leahy defeated Michael O'Sullivan | 1993 Welsh Open Snooker |
| Ryan Michael defeated John Leahy | 1993 Strachan Challenge - Event 2 Snooker |
| Dessie Sheehan defeated John Leahy | 1993 Irish Professional Championship Snooker |
| Craig Harrison defeated John Leahy | 1993 International Open Snooker |
| Matthew Couch defeated John Leahy | 1993 European Open Snooker |
| Darren Guest defeated John Leahy | 1993 British Open Snooker |
| John Leahy defeated Karen Corr | 1993 British Open Snooker |
| Wayne Rendle defeated John Leahy | 1993 Asian Open Snooker |
| John Leahy defeated Neil Cameron | 1993 Asian Open Snooker |
| Gerry Jones defeated John Leahy | 1992 World Championship Snooker |
| Stuart Henderson defeated John Leahy | 1992 Welsh Open Snooker |
| John Leahy defeated Tony Emmott | 1992 Welsh Open Snooker |
| John Leahy defeated Sean Coyle | 1992 Welsh Open Snooker |
| Ramu Vaswani defeated John Leahy | 1992 UK Championship Snooker |
| Julian Goodyear defeated John Leahy | 1992 Strachan Open Snooker |
| Matthew Spade defeated John Leahy | 1992 Strachan Challenge - Event 1 Snooker |
| Fergal O'Brien defeated John Leahy | 1992 Irish Professional Championship Snooker |
| John Leahy defeated Karen Corr | 1992 Irish Professional Championship Snooker |
| John Rees defeated John Leahy | 1992 Grand Prix Snooker |
| Mark King defeated John Leahy | 1992 European Open Snooker |
| Jason Scott defeated John Leahy | 1992 Dubai Classic Snooker |
| Paul Cavney defeated John Leahy | 1992 Classic Snooker |
| John Leahy defeated Brian Cakebread | 1992 Classic Snooker |
| Paul Davies defeated John Leahy | 1992 British Open Snooker |
| John Leahy defeated Peter Peratikou | 1992 British Open Snooker |
| John Leahy defeated Norman MacLachlan | 1992 British Open Snooker |
| John Leahy defeated Darren Hackeson | 1992 British Open Snooker |
| Nick Walker defeated John Leahy | 1992 Asian Open Snooker |
| Leigh Robinson defeated John Leahy | 1991 UK Championship Snooker |
| Steve Mifsud defeated John Leahy | 1991 Grand Prix Snooker |
| Steve Whalley defeated John Leahy | 1991 Dubai Classic Snooker |
| John Leahy defeated Graham Bradley | 1991 Dubai Classic Snooker |