Head to head
1
Hard
1
1
Clay
0
1
Grass
0
John Isner's wins on the left · Radu Albot's on the right · bar lengths share one scale
All meetings (4)
| 2018 | Wimbledon | Grass | R32 | John Isner | 6-3 6-3 6-4 |
| 2018 | Lyon | Clay | R16 | John Isner | 7-6(3) 6-3 |
| 2018 | Delray Beach | Hard | R32 | John Isner | 5-7 6-3 6-4 |
| 2018 | New York | Hard | R16 | Radu Albot | 7-6(5) 3-6 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.