Arata Onozawa defeated Koichi Sano 2-6 7-6 6-0 in the Vietnam F4 round of 32 on hard. The upset overturned the form book — Koichi Sano came in leading the head-to-head 1–0, but Arata Onozawa had been the form player, winning 1 of their last 4 on hard. Arata Onozawa claimed a first win over Koichi Sano in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-06-12 | Japan F8 | R16 | carpet | Koichi Sano | 2-6 6-1 6-0 |
Averages over each player's completed matches in the selected window (39 vs 7). ATP, WTA & Challenger.
wins 57% of points on serve vs Onozawa A.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About