Head to head
1
Hard
0
1
Clay
0
2
Carpet
0
John Alexander's wins on the left · Paul Gerken's on the right · bar lengths share one scale
All meetings (5)
| 1975 | Tokyo WCT | Carpet | R32 | John Alexander | 6-4 6-2 |
| 1975 | Dayton | Carpet | R16 | John Alexander | 7-6 3-6 6-3 |
| 1974 | Los Angeles | Hard | R64 | John Alexander | 6-4 6-2 |
| 1974 | Las Vegas | Hard | R32 | Paul Gerken | W/O |
| 1969 | Indianapolis | Clay | R64 | John Alexander | 4-6 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.