Ryota Tanuma defeated Issei Okamura 7-6 6-4 in the Japan F5 round of 32 on clay. Ryota Tanuma extended the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-01-08 | China F1 | R16 | clay | Ryota Tanuma | 6-1 6-2 |
| 2016-07-18 | China F13 | SF | clay | Issei Okamura | 6-3 7-6(5) |
| 2016-05-16 | Spain F14 | R32 | clay | Ryota Tanuma | 6-0 6-3 |
| 2015-08-17 | Chinese Taipei F1 | QF | hard | Issei Okamura | 6-4 3-6 6-3 |
Averages over each player's completed matches in the selected window (24 vs 25). 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