Jurgen Melzer of Austria has upset fifth-seeded Italian Andreas Seppi 6-2, 6-3 to advance to the quarter-finals of Zagreb Indoors tournament.

Melzer was a late entry and had to play in qualifiers, but has lost just nine games in his first two matches. Melzer – a 2010 semi-finalist – served nine aces against Seppi and converted four of his seven break points.

“I am very happy with the way I played so far,” he said. “I needed some matches after an early exit in Melbourne, where I lost in the first round. … And after many injury problems I had last year now I finally play pain free.”

Seventh-seeded Robin Haase from the Netherlands also advanced after rallying to beat Matthias Bachinger from Germany 7-6 (4), 3-6, 6-3.

In the remaining first-round matches, Slovenian wild card Grega Zemlja beat Croat Antonio Veic 7-6 (5), 7-6 (6), Dudi Sela of Israel defeated Andreas Beck of Germany 3-6, 6-3, 6-2, and Guillermo Garcia-Lopez of Spain ousted Daniel Evans of Britain 6-4, 1-6, 6-1.