Yaoki Ishii defeated Arata Onozawa 6-7 7-6 6-0 in the Japan F6 round of 16 on carpet. Yaoki Ishii extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-06-21 | Japan F7 | R32 | carpet | Yaoki Ishii | 6-3 2-6 7-5 |
| 2009-06-08 | Japan F4 | R16 | clay | Arata Onozawa | 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.