| Tournament | Round | Betty Irwin | Judy Hay |
| 21.05.2000 Ulladulla (NSW) | 2 | 341 | 401 |
| 23.11.2003 ACT Championships (ACT) | 3 | 336 | 370 |
| 23.02.2006 Ulladulla Summer Games Thursday (NSW) | 4 | 289 | 326 |
| 17.06.2006 Wollongong Marj Babb (NSW) | 4 | 318 | 360 |
| 20.05.2007 Ulladulla 2007 (NSW) | 8 | 320 | 387 |
| Head-to-head after 5 games | 0 | 5 | |
| Average score | 320.8 | 368.8 | |
| Spread: | -240 | 240 | |