| Tournament | Round | Ethel Collins | Jan Serisier |
| 25.01.1998 City of Sydney International Masters (NSW) | 18 | 442 | 301 |
| 26.07.1998 Winter Masters (NSW) | 10 | 383 | 343 |
| 30.08.1998 Baulkham Hills (NSW) | 6 | 410 | 330 |
| 17.01.1999 Baulkham Hills (NSW) | 6 | 270 | 364 |
| Head-to-head after 4 games | 3 | 1 | |
| Average score | 376.25 | 334.5 | |
| Spread: | 167 | -167 | |