| Tournament | Round | Dianne Ward | Bettina Tonkin |
| 12.07.1998 WA Masters (WA) | 2 | 288 | 341 |
| 14.08.2011 OPEN AUGUST (WA) | 6 | 346 | 363 |
| 22.03.2015 MARCH OPEN (WA) | 7 | 430 | 295 |
| 29.10.2017 November Open (WA) | 1 | 409 | 371 |
| Head-to-head after 4 games | 2 | 2 | |
| Average score | 368.25 | 342.5 | |
| Spread: | 103 | -103 | |