Head to head
1
Hard
1
0
Clay
2
0
Carpet
1
Paul Gerken's wins on the left · Juan Gisbert Sr's on the right · bar lengths share one scale
All meetings (5)
| 1974 | Washington-2 | Clay | R32 | Juan Gisbert Sr | 3-6 6-1 6-4 |
| 1974 | Tokyo WCT | Hard | QF | Juan Gisbert Sr | 7-6 6-1 |
| 1973 | Madrid-1 | Clay | R16 | Juan Gisbert Sr | 6-1 6-7 6-2 |
| 1973 | Calgary | Hard | SF | Paul Gerken | 6-1 5-7 6-3 |
| 1973 | Omaha | Carpet | QF | Juan Gisbert Sr | 6-3 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.