| Tournament | Round | Isabel Van Hoorn | Sal Costanzo |
| 15.11.1998 Geelong (VIC) | 1 | 309 | 428 |
| 30.12.2000 Decathon (VIC) | 2 | 328 | 429 |
| 24.06.2001 Nunawading (VIC) | 2 | 375 | 463 |
| 29.12.2001 Decathon (VIC) | 5 | 361 | 420 |
| 08.06.2003 Victorian Championships (VIC) | 3 | 300 | 342 |
| 06.11.2005 Geelong (VIC) | 5 | 292 | 451 |
| Head-to-head after 6 games | 0 | 6 | |
| Average score | 327.5 | 422.16 | |
| Spread: | -568 | 568 | |