Daniel Vacek defeated Jan Michael Gambill 6-4 2-6 7-5 7-6 in the Roland Garros round of 64 on clay. The upset overturned the form book — Jan Michael Gambill came in leading the head-to-head 1–0. Daniel Vacek claimed a first win over Jan Michael Gambill in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-10-26 | Stuttgart Masters | R64 | carpet | Jan Michael Gambill | 6-3 4-6 6-3 |
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 (139 vs 200). ATP, WTA & Challenger.