Enrico Wellenfeld defeated Christian Grunes 6-3 5-7 6-2 in the Poland F5 round of 32 on clay. The upset overturned the form book — Christian Grunes came in leading the head-to-head 1–0. Enrico Wellenfeld claimed a first win over Christian Grunes in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-08-29 | Poland F7 | R32 | clay | Christian Grunes | 6-3 6-4 |