Head to head
2
Hard
3
0
Clay
1
Nicolas Kiefer's wins on the left · Jan-Michael Gambill's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (6)
| 2004 | Memphis | Hard | QF | Nicolas Kiefer | 6-3 6-4 |
| 2003 | Delray Beach | Hard | R32 | Jan-Michael Gambill | 6-2 6-4 |
| 2002 | Los Angeles | Hard | QF | Jan-Michael Gambill | 7-5 7-6(5) |
| 2000 | Washington | Hard | QF | Nicolas Kiefer | 4-6 6-4 6-2 |
| 2000 | Roland Garros | Clay | R128 | Jan-Michael Gambill | 6-3 7-5 6-1 |
| 1998 | Scottsdale | Hard | R16 | Jan-Michael Gambill | 6-2 6-1 |
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.