| Tournament | Round | Gloria Gallagher | Zina Costanzo |
| 01.08.1999 Winter Masters (NSW) | 16 | 342 | 367 |
| 30.01.2000 City of Sydney International Masters (NSW) | 3 | 324 | 396 |
| 27.01.2001 City of Sydney International Masters (NSW) | 14 | 486 | 324 |
| 27.01.2002 City of Sydney International Masters (NSW) | 5 | 338 | 377 |
| Head-to-head after 4 games | 1 | 3 | |
| Average score | 372.5 | 366 | |
| Spread: | 26 | -26 | |