Timo Nieminen defeated Frederik Nielsen 6-4 6-3 in the Finland F2 round of 32 on clay. The upset overturned the form book — Frederik Nielsen came in leading the head-to-head 4–1. Timo Nieminen narrowed the head-to-head to 4–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-09-21 | Sweden F2 | SF | hard | Frederik Nielsen | 6-3 7-6(3) |
| 2009-09-14 | Sweden F1 | F | hard | Timo Nieminen | 6-2 6-2 |
| 2009-03-06 | Davis Cup G2 R1: DEN vs FIN | RR | hard | Frederik Nielsen | 2-6 6-4 6-2 6-3 |
| 2006-08-21 | Finland F2 | SF | hard | Frederik Nielsen | 5-7 6-1 6-4 |
| 2005-11-21 | Australia F11 | R16 | grass | Frederik Nielsen | 1-6 6-1 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.