Head to head
0
Hard
1
1
Clay
1
0
Grass
1
0
Carpet
2
John Alexander's wins on the left · John McEnroe's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (6)
| 1982 | Davis Cup WG SF: AUS vs USA | Hard | RR | John McEnroe | 6-4 6-3 |
| 1979 | Davis Cup WG SF: AUS vs USA | Grass | RR | John McEnroe | 9-7 6-2 9-7 |
| 1979 | Forest Hills WCT | Clay | RR | John McEnroe | 6-3 6-0 |
| 1979 | WCT Finals | Carpet | QF | John McEnroe | 6-4 6-0 6-2 |
| 1979 | Milan WCT | Carpet | F | John McEnroe | 6-4 6-3 |
| 1977 | Toronto-2 | Clay | R16 | John Alexander | 7-5 6-7 6-2 |
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.