Mathias Huning defeated Hernan Gumy 7-6 6-1 in the Brazil 1 Masters 2 round of 32 on clay. The upset overturned the form book — Hernan Gumy came in leading the head-to-head 1–0. Mathias Huning claimed a first win over Hernan Gumy in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-03-18 | Brazil 1 Masters 1 | R16 | clay | Hernan Gumy | 7-6 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.