Sadik Kadir defeated Frederik Nielsen 6-3 3-6 6-3 in the Poland F2 qualifying round on clay. The upset overturned the form book — Frederik Nielsen came in leading the head-to-head 1–0. Sadik Kadir claimed a first win over Frederik Nielsen in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-06-23 | Ireland F2 | R32 | carpet | Frederik Nielsen | 6-3 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.