| Tournament | Round | Derek McKenzie | Doris Schwenn |
| 15.04.1998 Australian Championships (TAS) | 17 | 406 | 397 |
| 05.04.1999 Australian Championships (NSW) | 1 | 477 | 351 |
| 05.04.1999 Australian Championships (NSW) | 21 | 428 | 306 |
| Head-to-head after 3 games | 3 | 0 | |
| Average score | 437 | 351.33 | |
| Spread: | 257 | -257 | |