Head to head
1
Hard
1
1
Clay
1
1
Grass
0
Sjeng Schalken's wins on the left · Daniel Vacek's on the right · bar lengths share one scale
All meetings (5)
| 1999 | Auckland | Hard | R16 | Sjeng Schalken | 6-4 6-4 |
| 1998 | Canada Masters | Hard | R64 | Daniel Vacek | 4-6 6-3 6-4 |
| 1998 | Roland Garros | Clay | R128 | Daniel Vacek | 1-6 6-2 6-4 7-5 |
| 1996 | Roland Garros | Clay | R128 | Sjeng Schalken | 6-3 6-3 1-6 6-3 |
| 1994 | Rosmalen | Grass | R32 | Sjeng Schalken | 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.