Stefan Seifert defeated Alexander Sadecky 5-7 6-1 6-1 in the Germany F18 qualifying round on hard. The result followed the form book — Stefan Seifert came in leading the head-to-head 2–1. Stefan Seifert extended the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2012-09-24 | Germany F17 | QF | carpet | Stefan Seifert | 7-5 6-4 |
| 2008-03-10 | Switzerland F3 | QF | carpet | Alexander Sadecky | 7-6(1) 7-5 |
| 2007-10-08 | Germany F19 | R16 | hard | Stefan Seifert | 6-3 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.