Issei Okamura defeated Chan Yeong Oh 6-2 6-4 in the M15 Tanagura 1 round of 32 on hard. Issei Okamura extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-06-05 | M25 Daegu 1 | Q32 | hard | Chan Yeong Oh | 6-1 4-6 10-7 |
| 2016-09-12 | Vietnam F4 | R32 | hard | Issei Okamura | 7-6(6) 6-3 |