Steven Moneke defeated Marc Sieber 7-5 6-1 in the Croatia F6 qualifying round on clay. The upset overturned the form book — Marc Sieber came in leading the head-to-head 1–0. Steven Moneke claimed a first win over Marc Sieber in two meetings, levelling the head-to-head at 1–1.
Moneke S. took it in straight sets.
Steven Moneke beat Marc Sieber 7-5 6-1. Umpiry, "Steven Moneke vs Marc Sieber — Croatia F6 Qualifying Round", https://umpiry.com/match/2012-04-02/moneke-vs-sieber-croatia-f6-qf?utm_source=cite (as of 2 April 2012).