Mikael Tillstrom defeated Giorgio Carneade 6-2 6-4 in the USA 1 Masters 4 round of 32 on clay. The upset overturned the form book — Giorgio Carneade came in leading the head-to-head 1–0. Mikael Tillstrom claimed a first win over Giorgio Carneade in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-03-22 | USA 1 Masters 2 | R64 | clay | Giorgio Carneade | 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.