01/By surface
each with its own count, at equal weight
Hard
3-0
J. leads 3-0 in 3 meetings on hard
Clay
Never on clay
no meeting on this surface
Grass
Never on grass
no meeting on this surface
02/Every meeting
3 rows, newest first
| Date | Tournament | Surface | Round | Winner | Score, winner first | Ranks, J. first |
|---|---|---|---|---|---|---|
| Oct 18, 2018 | Stockholm OpenATP250 | hard | 2nd round | Isner J. | 7-6, 6-7, 7-6 | 10 v 102 |
| Aug 27, 2018 | US OpenGrand Slam, best of 5 | hard | 1st round | Isner J. | 7-6, 6-3, 6-4 | 11 v 92 |
| Aug 20, 2014 | Winston-Salem Open at Wake Forest UniversityATP250 | hard | 2nd round | Isner J. | 7-6, 6-2 | 15 v 117 |
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. Isner J. and Klahn B. each carry the table against every opponent faced.