Head to head
2
Hard
1
0
Clay
1
0
Grass
3
1
Carpet
4
Bill Scanlon'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 (12)
| 1984 | Wimbledon | Grass | R16 | John McEnroe | 6-3 6-3 6-1 |
| 1984 | Madrid | Carpet | QF | John McEnroe | 6-4 7-6 |
| 1983 | US Open | Hard | R16 | Bill Scanlon | 7-6 7-6 4-6 6-3 |
| 1983 | Wimbledon | Grass | R16 | John McEnroe | 7-5 7-6 7-6 |
| 1982 | WCT Finals | Carpet | QF | John McEnroe | 5-7 6-4 2-6 7-6(8) 6-4 |
| 1981 | Tokyo-2 | Carpet | QF | John McEnroe | 6-4 6-3 |
| 1981 | San Francisco | Carpet | QF | Bill Scanlon | 3-6 7-6 6-2 |
| 1981 | Queen's Club | Grass | R16 | John McEnroe | 6-3 6-2 |
| 1981 | Los Angeles | Hard | SF | John McEnroe | 6-3 6-3 |
| 1979 | San Jose-2 | Carpet | QF | John McEnroe | 6-7 7-5 6-4 |
| 1978 | Maui | Hard | SF | Bill Scanlon | 6-2 3-6 6-3 |
| 1977 | Indianapolis | Clay | R16 | John McEnroe | 6-3 7-5 |
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.