Stefan Seifert defeated Marc Sieber 6-2 6-1 in the Germany F6 round of 16 on clay. The upset overturned the form book — Marc Sieber came in leading the head-to-head 2–0. Stefan Seifert claimed a first win over Marc Sieber in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-07-28 | Germany F13 | R32 | clay | Marc Sieber | 3-6 6-3 6-3 |
| 2007-08-06 | Germany F12 | R32 | clay | Marc Sieber | 6-1 6-2 |
Averages over each player's completed matches in the selected window (2 vs 141). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About