| Tournament | Round | Joan Colburt | Derek McKenzie |
| 23.08.1998 Queensland Championships (QLD) | 12 | 370 | 412 |
| 11.10.1998 Greenbank (QLD) | 3 | 407 | 334 |
| 21.03.1999 Redcliffe (QLD) | 5 | 323 | 432 |
| 02.05.1999 Maelstrom (QLD) | 4 | 386 | 438 |
| Head-to-head after 4 games | 1 | 3 | |
| Average score | 371.5 | 404 | |
| Spread: | -130 | 130 | |