| Tournament | Round | Mary McMahon | Kris Howat |
| 18.07.1999 Nunawading (VIC) | 2 | 402 | 294 |
| 23.01.2000 Aestival (VIC) | 2 | 356 | 367 |
| 20.05.2001 Dandenong (VIC) | 2 | 383 | 381 |
| 19.01.2003 Bil Rose Aestival (VIC) | 5 | 394 | 312 |
| 27.07.2003 Bentleigh (VIC) | 5 | 444 | 349 |
| 07.06.2008 VIC CHAMPS (VIC) | 3 | 462 | 283 |
| 28.08.2010 Ballarat 2 (VIC) | 3 | 425 | 357 |
| 14.08.2011 2011 Vic AGM (VIC) | 1 | 360 | 402 |
| 27.12.2011 Decathon (VIC) | 4 | 394 | 356 |
| 11.06.2012 QUEEN'S BIRTHDAY (VIC) | 4 | 345 | 353 |
| 22.07.2012 Nunawading (VIC) | 4 | 355 | 354 |
| 11.11.2012 Geelong (VIC) | 2 | 264 | 448 |
| 31.08.2013 Ballarat Winter (VIC) | 6 | 361 | 420 |
| 10.11.2013 Geelong (VIC) | 1 | 433 | 385 |
| 18.05.2014 CRANBOURNE (VIC) | 6 | 519 | 346 |
| 06.07.2014 wysc fundraiser (VIC) | 1 | 369 | 451 |
| 24.08.2014 Interfund1 (VIC) | 4 | 465 | 334 |
| 14.09.2014 Interfund 2 (VIC) | 4 | 415 | 275 |
| 28.12.2014 Decathon (VIC) | 8 | 407 | 300 |
| 13.09.2015 Geelong 2 (VIC) | 3 | 403 | 314 |
| Head-to-head after 20 games | 14 | 6 | |
| Average score | 397.8 | 354.05 | |