Erika Sema defeated Wen Hsin Hsu 4-6 7-6 6-2 in the Hamanako 25K qualifying round on carpet. The upset overturned the form book — Wen Hsin Hsu came in leading the head-to-head 2–1. Erika Sema narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-09-06 | Noto 25K | R32 | carpet | Wen Hsin Hsu | 1-6 6-1 6-2 |
| 2009-08-31 | Tsukuba 25K | QF | hard | Erika Sema | 6-2 6-4 |
| 2009-05-25 | Gunma 25K | SF | carpet | Wen Hsin Hsu | 6-0 7-5 |
Averages over each player's completed matches in the selected window (199 vs 2). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About