| Tournament | Round | Hanne Marks | Ethel Collins |
| 25.01.1998 City of Sydney International Masters (NSW) | 13 | 349 | 320 |
| 25.01.1998 City of Sydney International Masters (NSW) | 17 | 279 | 500 |
| 26.07.1998 Winter Masters (NSW) | 17 | 342 | 317 |
| 12.12.1998 North Shore (NSW) | 3 | 414 | 317 |
| 17.01.1999 Baulkham Hills (NSW) | 7 | 330 | 360 |
| 21.01.1999 City of Sydney Masters (NSW) | 12 | 376 | 345 |
| 27.11.1999 North Shore (NSW) | 5 | 336 | 403 |
| Head-to-head after 7 games | 4 | 3 | |
| Average score | 346.57 | 366 | |
| Spread: | -136 | 136 | |