| Tournament | Round | Mary McMahon | Jeff Chelton |
| 14.06.1999 Victorian Championships (VIC) | 20 | 371 | 410 |
| 10.06.2002 Victorian Championships (VIC) | 1 | 358 | 312 |
| 10.06.2006 vic06 3 DAY (VIC) | 9 | 445 | 374 |
| 09.06.2014 Vic Champs (VIC) | 17 | 440 | 296 |
| Head-to-head after 4 games | 3 | 1 | |
| Average score | 403.5 | 348 | |
| Spread: | 222 | -222 | |