Joseph Sirianni defeated Per Thornadtsson 6-3 6-7 6-4 in the Baltic Masters 3 round of 32 on clay. The upset overturned the form book — Per Thornadtsson came in leading the head-to-head 1–0. Joseph Sirianni claimed a first win over Per Thornadtsson in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1997-06-27 | Denmark Masters 4 | R32 | clay | Per Thornadtsson | 6-2 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.