Head to head
Rivalry summary
John McEnroe and Alexander Mronz met 2 times on the ATP tour between 1991 and 1991. Their head-to-head is level at 1–1. By surface, they are level 1–1 on carpet.
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Carpet
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John McEnroe's wins on the left · Alexander Mronz's on the right · bar lengths share one scale
All meetings (3)
| 1991 | Birmingham | Carpet | R32 | Alexander Mronz | 6-3 4-6 6-3 |
| 1991 | Chicago | Carpet | QF | John McEnroe | W/O |
| 1991 | Philadelphia | Carpet | R32 | John McEnroe | 6-1 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.