| Tournament | Round | Mary McMahon | Alastair Richards |
| 07.03.2004 South Australian Championships (SA) | 4 | 389 | 486 |
| 07.03.2004 South Australian Championships (SA) | 14 | 403 | 399 |
| 17.04.2006 Australian Championships (QLD) | 7 | 404 | 385 |
| 17.04.2006 Australian Championships (QLD) | 21 | 318 | 433 |
| 10.06.2006 vic06 3 DAY (VIC) | 24 | 369 | 341 |
| 11.06.2007 Victorian Championships (VIC) | 17 | 342 | 439 |
| 29.12.2009 DECATHON (VIC) | 2 | 375 | 434 |
| 27.06.2010 Trans Tasman Support (VIC) | 5 | 367 | 467 |
| 28.03.2016 Australian Championship (SA) | 5 | 288 | 471 |
| Head-to-head after 9 games | 3 | 6 | |
| Average score | 361.66 | 428.33 | |
| Spread: | -600 | 600 | |