Koichi Sano defeated Kenichi Sakakibara 7-5 6-2 in the Japan F6 q64 on carpet. The result followed the form book — Koichi Sano came in leading the head-to-head 3–0. Koichi Sano extended the head-to-head to 4–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-06-01 | Japan F5 | Q32 | clay | Koichi Sano | 1-6 6-2 7-5 |
| 2014-06-02 | Japan F5 | Q16 | clay | Koichi Sano | 6-4 6-4 |
| 2013-06-10 | Japan F5 | Q32 | clay | Koichi Sano | 6-3 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.