Bumpei Sato defeated Takuto Niki 6-2 7-6 in the Japan F6 qualifying round on hard. The upset overturned the form book — Takuto Niki came in leading the head-to-head 7–0. Bumpei Sato claimed a first win over Takuto Niki in eight meetings, narrowing the head-to-head to 7–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2014-05-26 | Guam F1 | SF | hard | Takuto Niki | 6-2 7-5 |
| 2014-03-10 | Japan F1 | R32 | hard | Takuto Niki | 6-0 4-6 6-3 |
| 2013-06-03 | Guam F1 | QF | hard | Takuto Niki | 6-2 6-4 |
| 2012-04-02 | Japan F4 | R16 | hard | Takuto Niki | 6-2 6-4 |
| 2012-03-26 | Japan F3 | R32 | hard | Takuto Niki | 6-4 6-4 |
| 2012-03-12 | Japan F1 | R32 | hard | Takuto Niki | 6-7(3) 6-4 4-0 |
| 2010-10-18 | Japan F10 | R32 | hard | Takuto Niki | 6-1 6-0 |
Averages over each player's completed matches in the selected window (2 vs 200). 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. Small sample — read as indicative. About