| Tournament | Round | Joan Colburt | Julie Gardiner |
| 17.05.1998 Southport Winter (QLD) | 1 | 398 | 433 |
| 23.08.1998 Queensland Championships (QLD) | 4 | 360 | 463 |
| 15.11.1998 Oyez (QLD) | 4 | 421 | 364 |
| 02.05.1999 Maelstrom (QLD) | 2 | 355 | 383 |
| Head-to-head after 4 games | 1 | 3 | |
| Average score | 383.5 | 410.75 | |
| Spread: | -109 | 109 | |