Head to head
0
Hard
1
0
Clay
1
1
Carpet
0
Daniel Vacek's wins on the left · Michael Chang's on the right · bar lengths share one scale
All meetings (3)
| 1999 | Hong Kong | Hard | R32 | Michael Chang | 6-1 6-4 |
| 1995 | Essen Masters | Carpet | R32 | Daniel Vacek | 6-2 7-6(5) |
| 1995 | Roland Garros | Clay | R64 | Michael Chang | 6-3 5-7 6-4 6-4 |
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.