Jan Michael Gambill defeated Daniel Vacek 6-3 4-6 6-3 in the Stuttgart Masters round of 64 on carpet. The upset overturned the form book — Daniel Vacek came in leading the head-to-head 1–0. Jan Michael Gambill claimed a first win over Daniel Vacek in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-05-25 | Roland Garros | R64 | clay | Daniel Vacek | 6-4 2-6 7-5 7-6(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 139). ATP, WTA & Challenger.