Daniel Nestor defeated Michael Robertson 6-2 7-6 in the USA 1 Masters 4 qualifying round on clay. The upset overturned the form book — Michael Robertson came in leading the head-to-head 1–0. Daniel Nestor claimed a first win over Michael Robertson 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 | Michael Robertson | 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.