Marcelo Filippini defeated Thomas Muster 6-3 6-4 in the St. Poelten quarter-final on clay. The upset overturned the form book — Thomas Muster came in leading the head-to-head 3–0, defending last year's quarter-final. Marcelo Filippini claimed a first win over Thomas Muster in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-08-24 | Boston | R32 | hard | Thomas Muster | 6-0 6-2 |
| 1998-05-11 | Rome Masters | R64 | clay | Thomas Muster | 6-1 6-0 |
| 1998-04-13 | Barcelona | R64 | clay | Thomas Muster | 6-3 2-6 6-2 |
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 (40 vs 69). ATP, WTA & Challenger.