Head to head
1
Clay
0
0
Grass
1
Jose-Luis Clerc's wins on the left · John Marks's on the right · bar lengths share one scale
All meetings (2)
| 1978 | Australian Open | Grass | R64 | John Marks | 6-7 RET |
| 1978 | Boston | Clay | R32 | Jose-Luis Clerc | 6-1 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.