Head to head
1
Hard
1
2
Grass
1
Stefan Kozlov's wins on the left · Steve Johnson's on the right · bar lengths share one scale
All meetings (5)
| 2022 | Newport | Grass | R32 | Steve Johnson | 7-5 6-3 |
| 2022 | Delray Beach | Hard | R16 | Stefan Kozlov | 6-1 6-3 |
| 2017 | Queen's Club | Grass | R32 | Stefan Kozlov | 3-6 6-1 6-1 |
| 2017 | Delray Beach | Hard | R32 | Steve Johnson | 6-1 6-4 |
| 2016 | 's-Hertogenbosch | Grass | R16 | Stefan Kozlov | 6-3 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.