Tobias Klein defeated Marius Zay 6-0 6-1 in the Germany F15 round of 16 on clay. The upset overturned the form book — Marius Zay came in leading the head-to-head 2–0. Tobias Klein claimed a first win over Marius Zay in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-09-08 | Germany F19 | R16 | clay | Marius Zay | 6-1 6-3 |
| 2005-01-24 | Germany F4 | R32 | carpet | Marius Zay | 6-2 3-6 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.