| Tournament | Round | Joan Colburt | Erica Williams |
| 03.05.1998 Maelstrom (QLD) | 7 | 390 | 335 |
| 23.08.1998 Queensland Championships (QLD) | 3 | 400 | 359 |
| 31.10.1998 Redland Bay (QLD) | 6 | 375 | 343 |
| 23.05.1999 Brisbane Open (QLD) | 4 | 293 | 490 |
| Head-to-head after 4 games | 3 | 1 | |
| Average score | 364.5 | 381.75 | |
| Spread: | -69 | 69 | |