Kevin Werwie defeated Douglas Sachs 6-4 7-6 in the USA 5 Masters 1 round of 32 on hard. The upset overturned the form book — Douglas Sachs came in leading the head-to-head 1–0. Kevin Werwie claimed a first win over Douglas Sachs in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-07-01 | USA 4 Masters 1 | R16 | hard | Douglas Sachs | 6-3 6-1 |