Head to head
1
Hard
1
1
Grass
0
1
Carpet
0
Jan Siemerink's wins on the left · Thomas Johansson's on the right · bar lengths share one scale
All meetings (4)
| 2000 | 's-Hertogenbosch | Grass | R32 | Jan Siemerink | 2-6 6-3 6-4 |
| 1999 | Toulouse | Hard | R32 | Thomas Johansson | 7-6(3) 6-1 |
| 1998 | Toulouse | Hard | SF | Jan Siemerink | 6-3 3-6 7-5 |
| 1998 | Rotterdam | Carpet | F | Jan Siemerink | 7-6(2) 6-2 |
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.