| Tournament | Round | Dianne Davis | John Spaan |
| 28.12.1999 Decathon (VIC) | 15 | 419 | 434 |
| 16.04.2001 Australian Championships (VIC) | 13 | 407 | 380 |
| 06.05.2001 NSW/Victoria Border Challenge Wagga Wagga (NSW) | 1 | 350 | 300 |
| 09.04.2007 Australian Championships (NSW) | 8 | 402 | 340 |
| 02.04.2018 2018 National Championship (ACT) | 6 | 365 | 383 |
| 04.04.2026 AUS CHAMPS (ACT) | 13 | 359 | 453 |
| Head-to-head after 6 games | 3 | 3 | |
| Average score | 383.66 | 381.66 | |
| Spread: | 12 | -12 | |