| Tournament | Round | Derek Mckenzie | Olga Visser |
| 23.08.1998 Queensland Championships (QLD) | 1 | 444 | 251 |
| 11.10.1998 Greenbank (QLD) | 2 | 424 | 437 |
| 21.03.1999 Redcliffe (QLD) | 2 | 491 | 302 |
| 02.05.1999 Maelstrom (QLD) | 6 | 363 | 420 |
| 23.05.1999 Brisbane Open (QLD) | 3 | 419 | 352 |
| 21.08.1999 Queensland Championships (QLD) | 14 | 445 | 287 |
| 02.04.2000 Brisbane Open (QLD) | 4 | 454 | 298 |
| 14.07.2001 Chatswood (NSW) | 7 | 445 | 522 |
| 21.07.2002 Winter Masters (NSW) | 17 | 403 | 432 |
| Head-to-head after 9 games | 5 | 4 | |
| Average score | 432 | 366.77 | |
| Spread: | 587 | -587 | |