By surface
| Surface | Ivo Karlovic | Donald Young |
|---|---|---|
| Hard | 2 | 2 |
All meetings (4)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2018-07-23 | ATP | Atlanta | Round of 32 | Hard | Donald Young | 6-2 | 6-75 | 6-76 | ||
| 2017-02-20 | ATP | Delray Beach | Round of 32 | Hard | Donald Young | 6-75 | 6-73 | |||
| 2016-08-29 | ATP | US Open | Round of 64 | Hard | Ivo Karlovic | 6-4 | 7-64 | 6-4 | ||
| 2015-02-16 | ATP | Delray Beach | Final | Hard | Ivo Karlovic | 6-3 | 6-3 |