G. Onclin and S. Mochizuki are level 1-1 in their head-to-head since 2018 over 2 matches.
| Surface | G. Onclin | S. Mochizuki |
|---|---|---|
| Grass | 0 | 1 |
| Hard | 1 | 0 |
| Date | Winner | Score | Event |
|---|---|---|---|
| June 24, 2026 | S. Mochizuki | 2 - 1 | Wimbledon · Semi-finals · grass |
| March 20, 2023 | G. Onclin | 2 - 0 | Saint Brieuc Challenger Men · 1/16-finals · hard |