Guilherme Valdoleiros defeated M. Martinez 2-6 6-1 10-7 in the M15 Madrid 4 q16 on clay. The upset overturned the form book — M. Martinez came in leading the head-to-head 1–0. Guilherme Valdoleiros claimed a first win over M. Martinez in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2023-11-12 | M25 Vale do Lobo 1 | Q32 | hard | M. Martinez | 6-0 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.