Masaki Sasai advanced when Hiromasa Oku retired 6-0 1-0 in the Japan F3 q16. 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 |
| 2011-06-20 | Japan F7 | R32 | grass | Masaki Sasai | 6-3 6-1 |
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