Head to head
0
Grass
1
1
Carpet
0
Thomaz Koch's wins on the left · John Alexander's on the right · bar lengths share one scale
All meetings (2)
| 1977 | Nottingham | Grass | R64 | John Alexander | 6-2 6-4 |
| 1968 | Philadelphia | Carpet | R16 | Thomaz Koch | 10-8 5-7 6-0 |
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.