Hiromasa Oku advanced when Arata Onozawa retired 6-4 1-0 in the Japan F7 round of 16. Hiromasa Oku extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-06-28 | Japan F8 | R16 | clay | Hiromasa Oku | 6-2 3-1 |
Averages over each player's completed matches in the selected window (19 vs 46). 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