Head to head
1
Clay
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Miguel Olvera's wins on the left · Jairo Velasco Sr.'s on the right · bar lengths share one scale
All meetings (2)
| 1972 | Davis Cup SAM QF: ECU vs COL | Clay | RR | Miguel Olvera | 6-2 2-6 6-0 5-7 6-2 |
| 1970 | Davis Cup SAM QF: COL vs ECU | Clay | RR | Jairo Velasco Sr. | 4-6 3-6 6-1 6-1 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.