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