| Tournament | Round | Kate Horan | Marilyn Mackie |
| 15.03.1998 Bunbury (WA) | 6 | 354 | 397 |
| 12.07.1998 WA Masters (WA) | 10 | 397 | 429 |
| 18.10.1998 Rockingham (WA) | 4 | 326 | 372 |
| 30.05.1999 Melville (WA) | 5 | 393 | 318 |
| 11.07.1999 Western Australian Masters (WA) | 14 | 458 | 356 |
| 15.11.2000 Coogee (WA) | 6 | 410 | 362 |
| 14.01.2001 WA Open (WA) | 3 | 422 | 354 |
| 26.05.2002 Melville (WA) | 6 | 377 | 328 |
| 31.05.2003 Western Australian Championships (WA) | 8 | 366 | 335 |
| Head-to-head after 9 games | 6 | 3 | |
| Average score | 389.22 | 361.22 | |
| Spread: | 252 | -252 | |