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