Bastian Knittel defeated Michael Lammer 6-3 6-7 6-3 in the Germany F1 qualifying round on carpet. The upset overturned the form book — Michael Lammer came in leading the head-to-head 2–1. Bastian Knittel narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-07-01 | Germany F8 | QF | clay | Bastian Knittel | 6-1 6-2 |
| 2004-01-12 | Germany F2 | R32 | hard | Michael Lammer | 7-5 6-3 |
| 2003-06-02 | Germany F6 | R32 | clay | Michael Lammer | 6-3 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.