Mike Bauer defeated Michael Robertson 6-4 7-6 in the USA 5 Masters 4 semi-final on hard. The upset overturned the form book — Michael Robertson came in leading the head-to-head 1–0. Mike Bauer claimed a first win over Michael Robertson in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-10-21 | USA 5 Masters 2 | R16 | hard | Michael Robertson | 7-6 4-6 6-2 |