Head to head
1
Hard
0
0
Clay
1
Jan-Michael Gambill's wins on the left · Daniel Vacek's on the right · bar lengths share one scale
All meetings (2)
| 1998 | Stuttgart Masters | Hard | R64 | Jan-Michael Gambill | 6-3 4-6 6-3 |
| 1998 | Roland Garros | Clay | R64 | Daniel Vacek | 6-4 2-6 7-5 7-6(0) |
Methodology
Head-to-head totals and surface splits exclude walkovers (no match was played), which follows ATP convention — walkover meetings still appear in the match list. The momentum chart plots the running lead across all counted meetings, oldest to newest.