Hiromasa Oku defeated Shunrou Takeshima 6-1 6-1 in the Japan F6 qualifying round on hard. The upset overturned the form book — Shunrou Takeshima came in leading the head-to-head 3–1. Hiromasa Oku narrowed the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2016-05-23 | Guam F1 | R32 | hard | Shunrou Takeshima | 6-3 6-2 |
| 2013-06-10 | Japan F5 | R32 | clay | Hiromasa Oku | 6-2 6-0 |
| 2013-04-01 | Japan F4 | R32 | hard | Shunrou Takeshima | 7-6(4) 6-0 |
| 2012-06-25 | Japan F7 | R32 | clay | Shunrou Takeshima | 7-5 6-0 |
Averages over each player's completed matches in the selected window (19 vs 20). 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