Head to head
1
Hard
0
1
Clay
0
Heinz Gunthardt's wins on the left · Deon Joubert's on the right · bar lengths share one scale
All meetings (2)
| 1980 | Johannesburg-1 | Hard | QF | Heinz Gunthardt | 6-3 6-2 |
| 1979 | Boston | Clay | R32 | Heinz Gunthardt | 7-6 5-7 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.