Kristijan Mesaros defeated Marc Sieber 6-3 6-2 in the Croatia F3 qualifying round on clay. The upset overturned the form book — Marc Sieber came in leading the head-to-head 3–0. Kristijan Mesaros claimed a first win over Marc Sieber in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-03-04 | Croatia F3 | R32 | clay | Marc Sieber | 7-6(5) 7-5 |
| 2011-04-04 | Croatia F5 | F | clay | Marc Sieber | 6-2 6-4 |
| 2007-08-13 | Germany F13 | R32 | clay | Marc Sieber | 6-2 6-0 |
Averages over each player's completed matches in the selected window (93 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