Arata Onozawa defeated Woong Sun Jun 5-7 7-6 7-5 in the Japan F5 qualifying round on clay. The upset overturned the form book — Woong Sun Jun came in leading the head-to-head 2–0. Arata Onozawa claimed a first win over Woong Sun Jun in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-09-07 | Korea F7 | QF | clay | Woong Sun Jun | 6-4 4-6 6-2 |
| 2011-10-24 | Laos F1 | QF | hard | Woong Sun Jun | 7-5 6-2 |
Averages over each player's completed matches in the selected window (46 vs 6). 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