Wen Hsin Hsu defeated Erika Sema 1-6 6-1 6-2 in the Noto 25K round of 32 on carpet. The upset overturned the form book — Erika Sema came in leading the head-to-head 2–1. Wen Hsin Hsu narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-09-27 | Hamanako 25K | QF | carpet | Erika Sema | 4-6 7-6(3) 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 (2 vs 91). 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