By surface
| Surface | Mark Cox | Hans Joachim Ploetz |
|---|---|---|
| Clay | 0 | 1 |
All meetings (2)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1969-03-17 | ATP | St. Petersburg | Round of 32 | Clay | Hans Joachim Ploetz | 1-6 | 6-2 | 4-6 | ||
| 1968-01-01 | ATP | Cape Town | Quarterfinal | — | Mark Cox | 6-2 | 6-1 |