Sophie Ferguson defeated Mashona Washington 5-7 6-4 6-3 in the Charleston round of 64 on clay. The upset overturned the form book — Mashona Washington came in leading the head-to-head 2–1. Sophie Ferguson narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-04-04 | Ponte Vedra Beach | Q32 | clay | Sophie Ferguson | 6-4 6-1 |
| 2009-11-16 | Toronto 50K | R16 | hard | Mashona Washington | 6-0 6-2 |
| 2009-08-03 | Vancouver 75K | R16 | hard | Mashona Washington | 7-6(7) 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.