| Tournament | Round | Mary McMahon | Doris Schwenn |
| 16.04.2001 Australian Championships (VIC) | 9 | 442 | 316 |
| 07.03.2004 South Australian Championships (SA) | 5 | 363 | 382 |
| 07.03.2004 South Australian Championships (SA) | 13 | 424 | 363 |
| Head-to-head after 3 games | 2 | 1 | |
| Average score | 409.66 | 353.66 | |
| Spread: | 168 | -168 | |