David Savic defeated Marc Sieber 6-1 7-5 in the Croatia F4 round of 32 on clay. The upset overturned the form book — Marc Sieber came in leading the head-to-head 2–0. David Savic claimed a first win over Marc Sieber in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-10-19 | Croatia F10 | R16 | clay | Marc Sieber | 6-4 6-1 |
| 2009-09-28 | Bosnia & Herzegovina F6 | QF | clay | Marc Sieber | 6-3 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.