Jonas Eriksson Ziverts defeated Karl Friberg 7-6 6-4 in the M25 Falun 1 round of 32 on hard. The upset overturned the form book — Karl Friberg came in ranked #1002, leading the head-to-head 2–0, but Jonas Eriksson Ziverts had been the form player, winning 3 of their last 6 on hard. Jonas Eriksson Ziverts claimed a first win over Karl Friberg in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-08-20 | M15 Bastad 2 | R32 | clay | Karl Friberg | 6-4 6-2 |
| 2017-08-14 | Finland F3 | QF | clay | Karl Friberg | 6-4 6-2 |