Yohei Ono defeated Hiromasa Oku 6-2 5-7 7-6 in the Japan F6 round of 32 on grass. Yohei Ono extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2014-06-16 | Japan F7 | SF | carpet | Hiromasa Oku | 6-2 6-4 |
| 2013-06-10 | Japan F5 | QF | clay | Yohei Ono | 6-2 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.