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