Fifth-seeded Martin Klizan of Slovakia came back from a set and a break down to beat Italian lucky-loser Matteo Viola 4-6, 7-6 (6), 6-1 Tuesday in the first round of the Zagreb Indoors.
After winning the first set, Viola led 3-2 in the second when Klizan broke back. Klizan later wasted two set points before winning the set in a tiebreak.
Somdev Devvarman of India also came back from a set and a break down to defeat two-time Zagreb finalist Michael Berrer, who retired because of fatigue when trailing 0-6, 7-6 (6), 4-1.
Also, Igor Sijsling of the Netherlands defeated Nikola Mektic of Croatia 6-4, 6-2, and Philipp Petzschner of Germany beat Mate Pavic of Croatia 7-5, 6-2.