Head to head
1
Hard
2
0
Clay
1
1
Grass
0
John Isner's wins on the left · Ivo Karlovic's on the right · bar lengths share one scale
All meetings (5)
| 2014 | Acapulco | Hard | R32 | Ivo Karlovic | 7-6(4) 7-6(5) |
| 2013 | Newport | Grass | QF | John Isner | 7-6(3) 7-6(3) |
| 2011 | Houston | Clay | QF | Ivo Karlovic | 7-6(2) 6-7(2) 7-6(9) |
| 2010 | Memphis | Hard | QF | John Isner | 6-1 7-6(7) |
| 2008 | New Haven | Hard | R32 | Ivo Karlovic | 6-7(4) 6-3 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.