John McEnroe defeated Thierry Guardiola 6-7 7-5 7-6 in the New Haven round of 32 on hard. The result followed the form book — John McEnroe came in leading the head-to-head 1–0, defending last year's quarter-final. John McEnroe extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-09-23 | Basel | R32 | hard | John McEnroe | 6-2 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.