| Tournament | Round | Ivor Zetler | Zina Costanzo |
| 27.01.2001 City of Sydney International Masters (NSW) | 17 | 391 | 357 |
| 08.09.2002 Beecroft Marathon (NSW) | 11 | 377 | 357 |
| 07.10.2002 New South Wales Championships (NSW) | 6 | 355 | 405 |
| 27.01.2003 City of Sydney International Masters (NSW) | 14 | 397 | 350 |
| Head-to-head after 4 games | 3 | 1 | |
| Average score | 380 | 367.25 | |
| Spread: | 51 | -51 | |