Head to head
1
Clay
0
0
Carpet
1
Pancho J.F. Guzman's wins on the left · Clark Graebner's on the right · bar lengths share one scale
All meetings (2)
| 1969 | Washington | Clay | R32 | Pancho J.F. Guzman | 7-9 7-5 6-4 |
| 1968 | Davis Cup AME F: USA vs ECU | Carpet | RR | Clark Graebner | 4-6 6-3 6-4 6-4 |
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.