01/By surface
each with its own count, at equal weight
Hard
2-0
I. leads 2-0 in 2 meetings on hard
Clay
Never on clay
no meeting on this surface
Grass
Never on grass
no meeting on this surface
02/Every meeting
2 rows, newest first
| Date | Tournament | Surface | Round | Winner | Score, winner first | Ranks, I. first |
|---|---|---|---|---|---|---|
| Feb 12, 2018 | New York OpenATP250 | hard | 1st round | Karlovic I. | 6-4, 7-6 | 89 v 58 |
| Sep 4, 2016 | US OpenGrand Slam, best of 5 | hard | 3rd round | Karlovic I. | 6-4, 7-6, 6-3 | 23 v 122 |
A record, never a share of meetings. Main-draw singles since 2013; a meeting ended by retirement is counted with the sets that were played and marked; a walkover is listed and counted in neither column. Karlovic I. and Donaldson J. each carry the table against every opponent faced.