Manfredi Graziani defeated Louroi Martinez 3-6 6-4 10-6 in the M25 Klosters 1 q32 on clay. The upset overturned the form book — Louroi Martinez came in leading the head-to-head 1–0. Manfredi Graziani claimed a first win over Louroi Martinez in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-03-08 | M25 Trimbach 1 | Q32 | carpet | Louroi Martinez | 7-5 6-4 |