Stefan Koubek defeated Christopher Kas 6-1 6-4 in the Zagreb qualifying round of 16 on hard. The result followed the form book — Stefan Koubek came in leading the head-to-head 1–0. Stefan Koubek extended the head-to-head to 2–0.
Koubek S. took it in straight sets.
Stefan Koubek beat Christopher Kas 6-1 6-4. Umpiry, "Stefan Koubek vs Christopher Kas — Zagreb Qualifying Round of 16", https://umpiry.com/match/2011-01-30/kas-vs-koubek-zagreb-q16?utm_source=cite (as of 30 January 2011).