| Tournament | Round | Joan Colburt | Michael Vnuk |
| 03.05.1998 Maelstrom (QLD) | 2 | 430 | 393 |
| 23.08.1998 Queensland Championships (QLD) | 14 | 407 | 413 |
| 31.10.1998 Redland Bay (QLD) | 4 | 391 | 335 |
| 15.11.1998 Oyez (QLD) | 7 | 447 | 341 |
| 02.05.1999 Maelstrom (QLD) | 3 | 345 | 382 |
| Head-to-head after 5 games | 3 | 2 | |
| Average score | 404 | 372.8 | |
| Spread: | 156 | -156 | |