Yuki Mochizuki defeated Takuto Niki 6-2 7-6 in the M25 Sapporo 2 round of 16 on hard. The upset overturned the form book — Takuto Niki came in leading the head-to-head 1–0. Yuki Mochizuki claimed a first win over Takuto Niki in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2019-04-12 | M25 Matsuyama 1 | R16 | hard | Takuto Niki | 6-2 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.