| Tournament | Round | Ruby Kotwall | Ethel Collins |
| 26.07.1998 Winter Masters (NSW) | 12 | 403 | 363 |
| 26.07.1998 Winter Masters (NSW) | 19 | 346 | 397 |
| 05.04.1999 Australian Championships (NSW) | 17 | 354 | 350 |
| Head-to-head after 3 games | 2 | 1 | |
| Average score | 367.66 | 370 | |
| Spread: | -7 | 7 | |