Horst Skoff defeated Diego Nargiso 7-5 6-4 in the Umag round of 32 on clay. The upset overturned the form book — Diego Nargiso came in leading the head-to-head 1–0. Horst Skoff claimed a first win over Diego Nargiso in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-09-23 | Palermo | R32 | clay | Diego Nargiso | 7-6(5) 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.