| Tournament | Round | Ruby Kotwall | Siva Sivapalasundram |
| 15.03.1998 Sutherland (NSW) | 5 | 331 | 351 |
| 05.10.1998 New South Wales Championships (NSW) | 11 | 460 | 331 |
| 14.11.1998 Sydney (NSW) | 6 | 403 | 325 |
| 05.04.1999 Australian Championships (NSW) | 10 | 377 | 332 |
| Head-to-head after 4 games | 3 | 1 | |
| Average score | 392.75 | 334.75 | |
| Spread: | 232 | -232 | |