Hyung Tae Kwon defeated Mark Nielsen 2-6 6-1 7-6 in the Japan F2 round of 16 on clay. The upset overturned the form book — Mark Nielsen came in leading the head-to-head 2–0. Hyung Tae Kwon claimed a first win over Mark Nielsen in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-06-09 | Japan F4 | R32 | clay | Mark Nielsen | 6-3 6-4 |
| 2004-04-19 | Japan F2 | R16 | carpet | Mark Nielsen | 6-3 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.