1998 Irish Masters
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The 1998 Irish Masters was the twenty-fourth edition of the professional invitational snooker tournament, which took place from 24 to 29 March 1998. The tournament was played at Goffs in Kill, County Kildare, and featured twelve professional players.
Ronnie O'Sullivan won the final 9–3 against Ken Doherty, however O'Sullivan failed a post-final drugs test and tested positive for cannabis. He was stripped of the title and disqualified from the tournament with the victory awarded to Doherty.
Main draw
| Round 1 Best of 11 frames | Quarter-finals Best of 11 frames | Semi-finals Best of 11 frames | Final Best of 17 frames | ||||||||||||||||
| England Ronnie O'Sullivan | 6 | ||||||||||||||||||
| England Ronnie O'Sullivan | 6 | Scotland Stephen Hendry | 3 | ||||||||||||||||
| England Jimmy White | 2 | England Ronnie O'Sullivan | 6 | ||||||||||||||||
| Scotland John Higgins | 4 | ||||||||||||||||||
| Scotland John Higgins | 6 | ||||||||||||||||||
| England Steve Davis | 6 | England Steve Davis | 3 | ||||||||||||||||
| England Nigel Bond | 5 | England Ronnie O'Sullivan | (Disqualified) | ||||||||||||||||
| Republic of Ireland Ken Doherty | |||||||||||||||||||
| Republic of Ireland Ken Doherty | 6 | ||||||||||||||||||
| Republic of Ireland Fergal O'Brien | 6 | Republic of Ireland Fergal O'Brien | 1 | ||||||||||||||||
| England Peter Ebdon | 2 | Republic of Ireland Ken Doherty | 6 | ||||||||||||||||
| England John Parrott | 1 | ||||||||||||||||||
| England John Parrott | 6 | ||||||||||||||||||
| England John Parrott | 6 | Wales Mark Williams | 3 | ||||||||||||||||
| Malta Tony Drago | 2 |
* Ronnie O'Sullivan was stripped of the title and disqualified from the tournament after winning 9–3. O'Sullivan failed a drugs test after testing positive for cannabis. Ken Doherty was awarded the title.