Takahiro Ittogi defeated Arata Onozawa 7-6 6-2 in the Japan F7 qualifying round on clay. The upset overturned the form book — Arata Onozawa came in leading the head-to-head 1–0. Takahiro Ittogi claimed a first win over Arata Onozawa in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-10-19 | Japan F9 | R16 | clay | Arata Onozawa | 6-4 4-0 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.