Head to head
1
Hard
0
2
Clay
0
1
Grass
0
2
Carpet
0
Jan Siemerink's wins on the left · Bernd Karbacher's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (6)
| 1996 | Rosmalen | Grass | R32 | Jan Siemerink | 6-2 6-4 |
| 1996 | Monte Carlo Masters | Clay | R64 | Jan Siemerink | 6-3 6-2 |
| 1995 | Stuttgart Indoor | Carpet | R16 | Jan Siemerink | 7-5 6-2 |
| 1993 | Rome Masters | Clay | R32 | Jan Siemerink | 6-1 6-4 |
| 1992 | Vienna | Carpet | R32 | Jan Siemerink | 6-1 6-4 |
| 1992 | Hong Kong | Hard | R16 | Jan Siemerink | 7-5 7-5 |
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.