Head to head
1
Clay
1
Jairo Velasco Sr.'s wins on the left · Stanislav Birner's on the right · bar lengths share one scale
All meetings (2)
| 1980 | Geneva | Clay | R32 | Stanislav Birner | 6-2 7-5 |
| 1978 | Madrid | Clay | R64 | Jairo Velasco Sr. | 6-1 2-6 7-5 |
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.