Head to head
1
Hard
0
0
Clay
1
Byron Bertram's wins on the left · Jairo Velasco Sr.'s on the right · bar lengths share one scale
All meetings (2)
| 1977 | Davis Cup EUR SF: RSA vs COL | Hard | RR | Byron Bertram | 0-6 3-6 6-4 12-10 6-1 |
| 1976 | Bournemouth | Clay | R64 | Jairo Velasco Sr. | 2-6 6-1 8-6 |
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.