M. Chambonniere defeated Raffael Schaer 6-2 6-4 in the M15 Casablanca 1 q32 on clay. The upset overturned the form book — Raffael Schaer came in leading the head-to-head 1–0. M. Chambonniere claimed a first win over Raffael Schaer in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-10-01 | M15 Monastir 40 | Q64 | hard | Raffael Schaer | 5-7 6-1 10-2 |