Hiromasa Oku defeated Takashi Saito 6-2 6-4 in the Japan F5 round of 32 on clay. The upset overturned the form book — Takashi Saito came in leading the head-to-head 1–0. Hiromasa Oku claimed a first win over Takashi Saito in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-06-01 | Japan F5 | F | clay | Takashi Saito | 6-3 6-1 |
Averages over each player's completed matches in the selected window (2 vs 10). 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