| Date | Tournament | State | Round | Mary McMahon | Gwen Chadwick |
|---|---|---|---|---|---|
| 21/02/1999 | Camberwell | VIC | 6 | 325 | 415 |
| 14/06/1999 | Victorian Championships | VIC | 14 | 372 | 360 |
| 12/06/2000 | Victorian Championships | VIC | 5 | 333 | 396 |
| 03/12/2000 | McKinnon | VIC | 4 | 406 | 335 |
| 09/06/2001 | Victorian Championships | VIC | 21 | 363 | 383 |
| 30/09/2001 | Essendon | VIC | 1 | 433 | 442 |
| 10/06/2002 | Victorian Championships | VIC | 13 | 435 | 350 |
| 01/12/2002 | McKinnon | VIC | 6 | 435 | 459 |
| 15/01/2006 | Aestival | VIC | 7 | 355 | 359 |
| 10/12/2006 | McKinnon 2006 | VIC | 4 | 365 | 368 |
| 21/01/2007 | AESTIVAL FESTIVAL 2007 | VIC | 6 | 350 | 282 |
| Head-to-head after 11 games | 4 | 7 | |||
| Average score | 379.27 | 377.18 | |||
| Spread | 23 | -23 | |||