Arata Onozawa defeated Yuki Matsuo 6-4 6-2 in the Kazakhstan F5 round of 32 on hard. The upset overturned the form book — Yuki Matsuo came in leading the head-to-head 1–0. Arata Onozawa claimed a first win over Yuki Matsuo in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-04-26 | Australia F3 | R32 | clay | Yuki Matsuo | 7-5 1-6 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.