Jacob Adaktusson defeated Per Thornadtsson 6-4 6-4 in the Sweden F2 round of 16 on hard. The upset overturned the form book — Per Thornadtsson came in leading the head-to-head 1–0. Jacob Adaktusson claimed a first win over Per Thornadtsson in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-08-23 | Ukraine F4 | QF | clay | Per Thornadtsson | 6-7 7-6 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.