| Tournament | Round | Bettina Tonkin | Elwyn Chalk |
| 12.07.1998 WA Masters (WA) | 12 | 392 | 386 |
| 17.01.1999 WA Open (WA) | 7 | 333 | 311 |
| 14.02.1999 Fremantle (WA) | 3 | 399 | 335 |
| 30.05.1999 Melville (WA) | 4 | 383 | 356 |
| 11.07.1999 Western Australian Masters (WA) | 17 | 323 | 371 |
| 19.09.1999 Spring Subiaco (WA) | 6 | 369 | 306 |
| 05.12.1999 Marathon December (WA) | 2 | 306 | 323 |
| 27.03.2000 Nedlands (WA) | 4 | 433 | 393 |
| 16.06.2002 Advanced Intermediate Recreation (WA) | 6 | 368 | 360 |
| 08.09.2002 Yokine (WA) | 2 | 371 | 349 |
| 25.05.2003 Melville (WA) | 2 | 287 | 413 |
| 14.09.2003 Maximin (WA) | 6 | 322 | 341 |
| 31.10.2004 Coogee (WA) | 2 | 511 | 274 |
| Head-to-head after 13 games | 9 | 4 | |
| Average score | 369 | 347.53 | |
| Spread: | 279 | -279 | |