Clayton Johnson defeated Mario Rincon 7-5 4-6 6-2 in the USA 3 Masters 2 round of 64 on hard. The upset overturned the form book — Mario Rincon came in leading the head-to-head 1–0. Clayton Johnson claimed a first win over Mario Rincon in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-06-03 | USA 3 Masters 3 | R32 | hard | Mario Rincon | 6-0 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.