Hiromasa Oku advanced when Min Kyu Song retired 2-6 7-6 0-1 in the Korea F5 qualifying round. Hiromasa Oku extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-03-18 | Japan F2 | Q16 | hard | Hiromasa Oku | 7-6(4) 7-5 |
Averages over each player's completed matches in the selected window (19 vs 50). 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