Albert Portas defeated Thomas Muster 6-4 7-5 in the Stuttgart Outdoor round of 32 on clay. The upset overturned the form book — Thomas Muster came in leading the head-to-head 1–0, but Albert Portas had been the form player, winning 3 of their last 6 on clay. Albert Portas claimed a first win over Thomas Muster in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-05-04 | Hamburg Masters | R64 | clay | Thomas Muster | 6-2 6-0 |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (200 vs 129). ATP, WTA & Challenger.