| Tournament | Round | Ruby Kotwall | Joan Rosenthal |
| 15.08.1998 Revesby (NSW) | 2 | 368 | 396 |
| 05.04.1999 Australian Championships (NSW) | 1 | 413 | 330 |
| 08.05.1999 Hassall Grove (NSW) | 1 | 390 | 452 |
| 04.10.1999 New South Wales Championships (NSW) | 10 | 291 | 364 |
| 23.10.1999 Spring Marathon (NSW) | 3 | 339 | 526 |
| Head-to-head after 5 games | 1 | 4 | |
| Average score | 360.2 | 413.6 | |
| Spread: | -267 | 267 | |