By surface
| Surface | Clark Graebner | Hans Joachim Ploetz |
|---|
All meetings (1)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1968-01-01 | ATP | Cape Town | Round of 16 | — | Hans Joachim Ploetz | 6-4 | 4-6 | 2-6 |
| Surface | Clark Graebner | Hans Joachim Ploetz |
|---|
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1968-01-01 | ATP | Cape Town | Round of 16 | — | Hans Joachim Ploetz | 6-4 | 4-6 | 2-6 |