Centuries By Ronnie O'Sullivan In Season 1997-1998
| Tournament | Total | Breaks - Venue | Breaks - Qualifying | Rate |
|---|---|---|---|---|
 1998 World Championship |
5 | 141, 134, 118, 104, 100 | 15.6 | |
| 1998 British Open |
2 | 118, 107 | 15 | |
| 1998 Irish Masters |
3 | 123, 109, 107 | 13 | |
| 1998 Charity Challenge |
1 | 141 | 42 | |
| 1998 Scottish Open |
2 | 108, 104 | 27 | |
| 1998 Masters |
1 | 124 | 20 | |
| 1998 Welsh Open |
4 | 127, 110, 104, 101 | 6 | |
| 1998 Premier League | 1 | 105 | 48 | |
| 1997 German Open |
1 | 116 | 33 | |
| 1997 UK Championship |
3 | 124, 113, 105 | 28.67 | |
| 1997 Scottish Masters |
2 | 120, 105 | 7 |