| Tournament | Round | Mary McMahon | Karen Richards |
| 08.06.1998 Victorian Championships (VIC) | 3 | 417 | 380 |
| 05.04.1999 Australian Championships (NSW) | 13 | 350 | 345 |
| 12.09.1999 Victorian Country Championships (VIC) | 6 | 555 | 221 |
| 28.12.1999 Decathon (VIC) | 2 | 424 | 328 |
| 12.06.2000 Victorian Championships (VIC) | 12 | 374 | 379 |
| 09.06.2001 Victorian Championships (VIC) | 5 | 360 | 437 |
| 10.06.2002 Victorian Championships (VIC) | 5 | 374 | 363 |
| 10.06.2006 vic06 3 DAY (VIC) | 17 | 418 | 320 |
| 28.03.2016 Australian Championship (SA) | 6 | 323 | 398 |
| Head-to-head after 9 games | 6 | 3 | |
| Average score | 399.44 | 352.33 | |
| Spread: | 424 | -424 | |