Head to head
0
Hard
1
0
Grass
1
1
Carpet
0
Jan Siemerink's wins on the left · Nicolas Kiefer's on the right · bar lengths share one scale
All meetings (3)
| 2001 | Davis Cup WG QF: NED vs GER | Carpet | RR | Jan Siemerink | 6-3 7-6(5) 3-6 6-3 |
| 1999 | Halle | Grass | QF | Nicolas Kiefer | 6-4 6-2 |
| 1997 | Antwerp | Hard | R32 | Nicolas Kiefer | 3-6 6-4 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.