| Tournament | Round | Marie Knight | Sal Costanzo |
| 25.01.1998 City of Sydney International Masters (NSW) | 9 | 374 | 299 |
| 25.01.1998 City of Sydney International Masters (NSW) | 17 | 365 | 369 |
| 08.06.1998 Victorian Championships (VIC) | 2 | 504 | 348 |
| 05.10.1998 New South Wales Championships (NSW) | 19 | 442 | 317 |
| 21.01.1999 City of Sydney Masters (NSW) | 9 | 314 | 389 |
| 12.06.2000 Victorian Championships (VIC) | 2 | 506 | 329 |
| Head-to-head after 6 games | 4 | 2 | |
| Average score | 417.5 | 341.83 | |
| Spread: | 454 | -454 | |