Anton Krondell defeated Oscar Dahlberg 6-0 6-1 in the M25 Falun 1 q16 on hard. The upset overturned the form book — Oscar Dahlberg came in leading the head-to-head 1–0. Anton Krondell claimed a first win over Oscar Dahlberg in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-09-19 | M25 Jonkoping 1 | Q32 | hard | Oscar Dahlberg | 6-4 5-7 10-7 |