Head to head
0
Hard
1
1
Grass
2
John Alexander's wins on the left · Sammy Giammalva Jr.'s on the right · bar lengths share one scale
All meetings (4)
| 1983 | Queen's Club | Grass | R64 | Sammy Giammalva Jr. | 4-6 7-6 7-5 |
| 1982 | Sydney-2 | Grass | SF | John Alexander | 6-3 6-2 |
| 1982 | Australian Open | Grass | R16 | Sammy Giammalva Jr. | 4-6 7-6 6-1 |
| 1981 | Tampa | Hard | R16 | Sammy Giammalva Jr. | 6-2 7-6 |
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.