Head to head
0
Hard
3
1
Clay
0
0
Grass
1
Jack Sock's wins on the left · Ivo Karlovic's on the right · bar lengths share one scale
All meetings (5)
| 2016 | Washington | Hard | QF | Ivo Karlovic | 7-6(4) 7-6(6) |
| 2015 | Newport | Grass | SF | Ivo Karlovic | 7-6(3) 6-4 |
| 2014 | Houston | Clay | R32 | Jack Sock | 6-1 6-4 |
| 2014 | Memphis | Hard | QF | Ivo Karlovic | 7-6(4) 6-7(3) 6-3 |
| 2013 | Indian Wells Masters | Hard | R128 | Ivo Karlovic | 3-6 7-6(8) 6-2 |
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.