Top seeded and defending champion Novak Djokovic recovered from a first set loss to beat compatriot Viktor Troicki 3-6 6-4 6-2 in the second round of the Dubai Tennis Championships on Wednesday.

Troicki earned the break in the opening game of the first set and maintaned it till the end to wrap up the first set.

Djokovic continued to wrestle in the middle and managed to level the matchs scores at 1-all.

The third set was much more one-sided with Djokovic racing out to a 4-0, double break lead before Troicki even got off the mark, and sealing the win with a forehand winner down the line.

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Another Serbian Janko Tipsarevic posted the biggest upset of the day as he scored a 6-7 6-4 4-6 win against World No 4 Andy Murray in a gripping encounter.

Earlier in the day, fourth seed Nikolay Davydenko was forced to retire with a wrist injury against Germany's Michael Berrer.

Davydenko lost the first set 6-3 before he decided to stop midway.

"It started yesterday afternoon," said Davydenko.

"I was thinking okay there's pain, but I will recover. But the match was different and it started to get swollen."

Austria's Juergen Melzer ousted Spaniard Tommy Robredo 6-3 7-5 to set up next round clash with Marin Cilic , who edged past  Austrian Stefan Koubek 6-2 7-6(6).