By surface
| Surface | John Marks | Robbie Venter |
|---|---|---|
| Hard | 0 | 1 |
All meetings (1)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1977-03-08 | ATP | Johannesburg | Round of 32 | Hard | Robbie Venter | 5-7 | 5-7 |
| Surface | John Marks | Robbie Venter |
|---|---|---|
| Hard | 0 | 1 |
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1977-03-08 | ATP | Johannesburg | Round of 32 | Hard | Robbie Venter | 5-7 | 5-7 |