Matthew Roberts defeated Marc Sieber 6-2 6-3 in the Mexico F8 round of 32 on hard. The upset overturned the form book — Marc Sieber came in leading the head-to-head 1–0. Matthew Roberts claimed a first win over Marc Sieber in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-06-30 | Austria F5 | SF | clay | Marc Sieber | 5-7 6-3 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.