Koichi Sano defeated Issei Okamura 4-6 7-5 6-3 in the Japan F1 q32 on hard. The upset overturned the form book — Issei Okamura came in leading the head-to-head 2–0. Koichi Sano claimed a first win over Issei Okamura in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2016-07-18 | China F13 | R16 | clay | Issei Okamura | 6-0 6-2 |
| 2015-06-08 | Japan F6 | R32 | hard | Issei Okamura | 6-2 6-4 |
Averages over each player's completed matches in the selected window (8 vs 200). ATP, WTA & Challenger.
wins 54% of points on serve vs Okamura I.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About