Head to head
1
Hard
3
0
Clay
1
Ivo Karlovic's wins on the left · Nicolas Kiefer's on the right · bar lengths share one scale
All meetings (5)
| 2008 | Paris Masters | Hard | R64 | Nicolas Kiefer | 6-4 7-5 |
| 2007 | Madrid Masters | Hard | R16 | Nicolas Kiefer | 7-6(5) 7-6(3) |
| 2005 | Roland Garros | Clay | R128 | Nicolas Kiefer | 6-3 6-3 6-4 |
| 2004 | Indianapolis | Hard | R32 | Nicolas Kiefer | 6-0 7-6(0) |
| 2003 | Shanghai | Hard | R16 | Ivo Karlovic | 6-1 7-6(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.