Marc Sieber defeated Johannes Ager 6-7 7-5 7-6 in the Austria F2 qualifying round on carpet. The upset overturned the form book — Johannes Ager came in leading the head-to-head 2–0. Marc Sieber claimed a first win over Johannes Ager in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-08-25 | Austria F8 | R16 | clay | Johannes Ager | 6-1 7-6(2) |
| 2008-07-07 | Austria F6 | SF | clay | Johannes Ager | 7-6(2) 3-6 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.