Isabella Holland defeated Ashling Sumner 6-2 6-3 in the Sydney 25K round of 32 on hard. The result followed the form book — Isabella Holland came in leading the head-to-head 3–0. Isabella Holland extended the head-to-head to 4–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2014-10-20 | Perth 25K | Q16 | hard | Isabella Holland | 5-7 6-2 6-0 |
| 2011-11-14 | Traralgon 25K | R32 | hard | Isabella Holland | 3-6 6-2 |
| 2010-09-13 | Darwin 25K | R32 | hard | Isabella Holland | 6-3 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.