Head to head
0
Hard
1
1
Grass
0
John James's wins on the left · Heinz Gunthardt's on the right · bar lengths share one scale
All meetings (2)
| 1978 | Johannesburg-2 | Hard | R32 | Heinz Gunthardt | 6-2 2-6 6-4 |
| 1978 | Queen's Club | Grass | R32 | John James | 6-4 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.