Head to head
1
Hard
0
1
Carpet
1
Thomaz Koch's wins on the left · Onny Parun's on the right · bar lengths share one scale
All meetings (3)
| 1973 | San Juan | Hard | RR | Thomaz Koch | 7-6 7-5 |
| 1972 | New York-1 | Carpet | R32 | Onny Parun | 7-5 6-3 |
| 1972 | Des Moines | Carpet | R16 | Thomaz Koch | 6-4 6-1 |
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.