Katarina Adamovic defeated Dunja Sunkic 7-5 2-6 6-1 in the Pirot 10K round of 32 on clay. The upset overturned the form book — Dunja Sunkic came in leading the head-to-head 1–0. Katarina Adamovic claimed a first win over Dunja Sunkic in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-08-26 | Belgrade 10K | R32 | clay | Dunja Sunkic | 6-2 6-4 |