Mario Martinez Serrano defeated Khololwam Montsi 7-6 1-6 6-2 in the M15 Fayetteville 1 round of 16 on hard. The upset overturned the form book — Khololwam Montsi came in leading the head-to-head 1–0. Mario Martinez Serrano claimed a first win over Khololwam Montsi in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-09-16 | M15 Fayetteville 1 | Q16 | hard | Khololwam Montsi | 6-3 6-1 |