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DUBAI, United Arab Emirates - Novak Djokovic defeated fellow Serb Janko Tipsarevic 6-1, 7-6 (6 ) on Thursday to set up a Dubai Championships semifinal with Andy Murray, who he beat in a marathon five-setter at the Australian Open last month.

Roger Federer will face Juan Martin del Potro in the other semi at Aviation Club. Del Potro beat Jo-Wilfried Tsonga 7-6 (1 ), 6-2 for the second time in two weeks.

Murray advanced by defeating fifth-seeded Tomas Berdych 6-3, 7-5. Roger Federer had another routine encounter, stopping Mikhail Youzhny 6-3, 6-4. The 16-time Grand Slam champion plays the winner of a later match between Juan Martin del Potro and Jo-Wilfried Tsonga.

Tipsarevic rallied in the second set, holding his serve throughout and taking a 4-1 lead in the tiebreaker. Tipsarevic missed a set point at 6-5 when he double-faulted, and Djokovic won the next two points.

"We know each other really well," said Djokovic, The top-ranked Djokovic, who is gunning for his fourth Dubai title in a row. "We both got a little bit nervous toward the end."

Tipsarevic admitted nerves got the better of him in the second-set tiebreaker, but not because he was facing a friend. "It's not only against Novak," Tipsarevic said. "It would have happened against anyone."