Mark Merklein defeated Roland Thornqvist 3-6 6-3 6-2 in the USA 3 Masters 3 semi-final on hard. Mark Merklein extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1993-07-09 | USA 4 Masters 2 | SF | hard | Mark Merklein | 7-6 7-5 |
| 1992-06-29 | USA 4 Masters 1 | R32 | hard | Roland Thornqvist | 6-2 4-6 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.