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