Head to head
1
Hard
1
0
Clay
1
Ivo Karlovic's wins on the left · Ryan Harrison's on the right · bar lengths share one scale
All meetings (3)
| 2019 | Houston | Clay | R32 | Ryan Harrison | 6-3 6-4 |
| 2018 | New York | Hard | R16 | Ivo Karlovic | 6-4 6-4 |
| 2015 | Acapulco | Hard | QF | Ryan Harrison | 4-6 7-6(0) 7-6(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.