Head to head
2
Hard
1
1
Clay
0
1
Carpet
0
Nicolas Lapentti's wins on the left · Jan Siemerink's on the right · bar lengths share one scale
All meetings (5)
| 1999 | Lyon | Carpet | R32 | Nicolas Lapentti | 3-6 6-3 7-6(4) |
| 1999 | Davis Cup WG PO: ECU vs NED | Clay | RR | Nicolas Lapentti | 6-4 4-6 6-3 6-2 |
| 1999 | Indianapolis | Hard | SF | Nicolas Lapentti | 6-4 6-2 |
| 1998 | New Haven | Hard | R64 | Jan Siemerink | 6-4 6-3 |
| 1997 | Long Island | Hard | R32 | Nicolas Lapentti | 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.