| Tournament | Round | Mary McMahon | Isabel Van Hoorn |
| 30.08.1998 Knox (VIC) | 4 | 301 | 392 |
| 21.03.1999 Prahran (VIC) | 1 | 390 | 311 |
| 05.12.1999 McKinnon (VIC) | 1 | 352 | 328 |
| 15.10.2000 Frankston (VIC) | 6 | 404 | 311 |
| 30.12.2000 Decathon (VIC) | 4 | 337 | 393 |
| 21.01.2001 Aestival (VIC) | 6 | 416 | 431 |
| 26.08.2001 Eastern Suburbs (VIC) | 5 | 388 | 367 |
| 04.04.2004 Langwarrin (VIC) | 3 | 323 | 401 |
| Head-to-head after 8 games | 4 | 4 | |
| Average score | 363.87 | 366.75 | |
| Spread: | -23 | 23 | |