| Tournament | Round | Derek Mckenzie | Julie Gardiner |
| 23.08.1998 Queensland Championships (QLD) | 8 | 408 | 382 |
| 21.02.1999 Ipswich (QLD) | 3 | 374 | 420 |
| 02.05.1999 Maelstrom (QLD) | 7 | 470 | 400 |
| 21.08.1999 Queensland Championships (QLD) | 8 | 402 | 334 |
| 26.08.2001 Queensland Championships (QLD) | 1 | 461 | 320 |
| 25.08.2002 Queensland Championships (QLD) | 15 | 404 | 310 |
| 23.02.2008 Early Warm-Up (QLD) | 2 | 409 | 282 |
| 04.05.2008 Queensland Championships (QLD) | 9 | 433 | 334 |
| Head-to-head after 8 games | 7 | 1 | |
| Average score | 420.12 | 347.75 | |
| Spread: | 579 | -579 | |