Horst Skoff defeated Thomas Muster 6-4 6-2 in the Kitzbuhel quarter-final on clay. The upset overturned the form book — Thomas Muster came in leading the head-to-head 3–2, but Horst Skoff had been the form player, winning 5 of their last 7 on clay. Horst Skoff narrowed the head-to-head to 3–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1993-05-24 | Roland Garros | R128 | clay | Thomas Muster | 0-6 6-3 6-4 6-2 |
| 1993-02-22 | Mexico City | QF | clay | Thomas Muster | 6-2 7-5 |
| 1991-09-09 | Geneva | F | clay | Thomas Muster | 6-2 6-4 |
| 1991-05-06 | Hamburg | R64 | clay | Horst Skoff | 7-5 6-2 |
| 1990-10-15 | Vienna | SF | hard | Horst Skoff | 6-2 7-6 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.