| Tournament | Round | Joan Ashton | Betty Mitchell |
| 19.07.1998 July (SA) | 4 | 286 | 420 |
| 12.09.1998 September (SA) | 6 | 308 | 323 |
| 25.10.1998 October (SA) | 4 | 327 | 323 |
| 19.01.2000 January Open (SA) | 6 | 290 | 304 |
| 13.02.2000 South Australian Championships (SA) | 3 | 374 | 407 |
| 09.02.2001 Unley February (SA) | 2 | 272 | 386 |
| Head-to-head after 6 games | 1 | 5 | |
| Average score | 309.5 | 360.5 | |
| Spread: | -306 | 306 | |