Marc Sieber defeated Antal Van Der Duim 6-4 6-4 in the Portugal F2 round of 32 on hard. The result followed the form book — Marc Sieber came in leading the head-to-head 1–0. Marc Sieber extended the head-to-head to 2–0.
Sieber M. took it in straight sets.
Hard: Sieber M. leads 1–0 · Clay: Sieber M. leads 1–0
Marc Sieber beat Antal Van Der Duim 6-4 6-4. Umpiry, "Marc Sieber vs Antal Van Der Duim — Portugal F2 Round of 32", https://umpiry.com/match/2011-03-07/duim-vs-sieber-portugal-f2-r32?utm_source=cite (as of 7 March 2011).