Issei Okamura defeated Takuto Niki 6-3 7-6 in the M25 Kashiwa 1 round of 32 on hard. The result followed the form book — Issei Okamura came in leading the head-to-head 1–0. Issei Okamura extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-04-01 | Japan F4 | SF | hard | Issei Okamura | 7-6(5) 2-6 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.