Erika Sema defeated Mari Tanaka 6-1 6-2 in the Niigata 25K round of 32 on hard. The result followed the form book — Erika Sema came in leading the head-to-head 2–1. Erika Sema extended the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-10-03 | Kofu 50K | R32 | hard | Erika Sema | 6-0 6-2 |
| 2008-07-28 | Obihiro 25K | R16 | carpet | Mari Tanaka | 7-5 6-7(5) 6-4 |
| 2005-10-31 | Sutama 25K | R32 | clay | Erika Sema | 6-1 6-4 |
Averages over each player's completed matches in the selected window (199 vs 3). 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