Shiho Hisamatsu defeated Mari Tanaka 6-3 6-1 in the Hamanako 25K round of 16 on carpet. The upset overturned the form book — Mari Tanaka came in leading the head-to-head 3–1. Shiho Hisamatsu narrowed the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-09-20 | Makinohara 25K | R32 | carpet | Mari Tanaka | 6-4 6-2 |
| 2010-03-22 | Kofu 10K | R16 | hard | Mari Tanaka | 7-6(6) 6-3 |
| 2008-09-08 | Noto 25K | R32 | carpet | Mari Tanaka | 7-5 6-4 |
| 2008-05-19 | Nagano 25K | R16 | carpet | Shiho Hisamatsu | 7-6(6) 2-6 6-3 |
Averages over each player's completed matches in the selected window (3 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. Small sample — read as indicative. About