| Tournament | Round | Janet Cotter | Trish Marchand |
| 25.04.1999 Nedlands (WA) | 2 | 351 | 399 |
| 27.03.2000 Nedlands (WA) | 4 | 430 | 306 |
| 11.03.2001 Bunbury (WA) | 5 | 340 | 413 |
| 21.04.2002 Nedlands (WA) | 1 | 301 | 315 |
| 14.07.2002 Bassendean (WA) | 4 | 316 | 274 |
| 10.03.2002 Bunbury (WA) | 3 | 389 | 394 |
| Head-to-head after 6 games | 2 | 4 | |
| Average score | 354.5 | 350.16 | |
| Spread: | 26 | -26 | |