| Tournament | Round | Margaret Wilton | Jan Osborn |
| 30.05.1999 Melville (WA) | 3 | 303 | 307 |
| 08.07.2000 Bassendean (WA) | 4 | 339 | 345 |
| 27.05.2001 Melville (WA) | 6 | 333 | 368 |
| 08.07.2001 Bassendean (WA) | 2 | 292 | 375 |
| Head-to-head after 4 games | 0 | 4 | |
| Average score | 316.75 | 348.75 | |
| Spread: | -128 | 128 | |