| Tournament | 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 | |