Head to head
2
Hard
2
Donald Young's wins on the left · Ivo Karlovic's on the right · bar lengths share one scale
All meetings (4)
| 2018 | Atlanta | Hard | R32 | Donald Young | 2-6 7-6(5) 7-6(6) |
| 2017 | Delray Beach | Hard | R32 | Donald Young | 7-6(5) 7-6(3) |
| 2016 | US Open | Hard | R64 | Ivo Karlovic | 6-4 7-6(4) 6-4 |
| 2015 | Delray Beach | Hard | F | Ivo Karlovic | 6-3 6-3 |
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.