Djokovic was unusually tentative at the start of his match but was always too streetwise for Switzerland's Marco Chiudinelli, winning 3-6, 6-1, 6-1, 6-3.

"I managed to make that transition from being defensive to being offensive and changing pace and holding the game," Djokovic said.

Davydenko steam-rollered Ukraine's Illya Marchenko 6-3, 6-3, 6-0 to maintain his unbeaten start to the year as he chases his maiden grand slam title while Hewitt survived a dogged challenge from American Donald Young to win 7-6, 6-4, 6-1.

Australian teenager Bernard Tomic received a dressing down from organizers after he blamed his second-round loss on the schedule. The 17-year-old was beaten in five sets by Croatian Marin Cilic on Wednesday in a match that finished well after 2am.

"I'm not trying to make any excuses, but I go to sleep at like nine, 10 normally. It's way past my bedtime," he said.

"If there doesn't become a change in his behavior, it becomes extremely hard for him to excel at the top echelons of the sport," Australian Open director Craig Tiley said.

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