Head to head
0
Hard
1
1
Grass
0
0
Carpet
1
John Marks's wins on the left · John Sadri's on the right · bar lengths share one scale
All meetings (3)
| 1979 | Taipei | Carpet | R32 | John Sadri | 6-1 7-6 |
| 1979 | Hong Kong | Hard | R32 | John Sadri | 6-3 2-6 6-2 |
| 1978 | Australian Open | Grass | R16 | John Marks | 6-2 6-2 4-6 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.