| Tournament | Round | Janet Cotter | Marilyn Mackie |
| 15.02.1998 Fremantle (WA) | 2 | 352 | 379 |
| 25.04.1999 Nedlands (WA) | 1 | 294 | 392 |
| 19.09.1999 Spring Subiaco (WA) | 6 | 316 | 346 |
| 13.01.2002 WA Open (WA) | 4 | 294 | 400 |
| 29.02.2004 Kwinana (WA) | 5 | 341 | 350 |
| Head-to-head after 5 games | 0 | 5 | |
| Average score | 319.39 | 373.4 | |
| Spread: | -270 | 270 | |