Masaki Sasai defeated Hiromasa Oku 6-3 6-1 in the Japan F7 round of 32 on grass. Masaki Sasai extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-05-25 | Guam F1 | R32 | hard | Hiromasa Oku | 6-1 6-1 |
| 2015-03-23 | Japan F3 | Q16 | hard | Masaki Sasai | 6-0 1-0 |
Averages over each player's completed matches in the selected window (12 vs 19). 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