Djokovic beats Tipsarevic, sets up Murray semi

By the win, he set up a meeting with Andy Murray in the last four.Murray, who wasted six match points and overcame a knee injury to beat Tomas Berdych 6-3 7-5, faces Djokovic for the first time since the Serb triumphed in a five-set epic in the Australian Open semi-finals in January.Roger Federer is also through to the semi-finals after beating Mikhail Youzhny 6-3 6-4 and will face either Argentine Juan Martin Del Potro or Frances Jo-Wilfried Tsonga on Friday.Djokovic, seeking a fourth straight Dubai title, bullied Tipsarevic from the outset, breaking to go 3-1 ahead in the first set of their night encounter.Tipsarevic, ranked a career-high ninth in the world, put up little resistance, netting a lazy backhand to give Djokovic a double break and an unassailable 5-1 lead.He made a better fist of the second set, matching Djokovics pounding groundstrokes in a series of ferocious rallies from the baseline.Yet the bespectacled Tipsarevic remained erratic. Serving at 2-2, he dispatched three aces and two double faults in the space of six points as he eventually held.The set went to a tiebreak. Tipsarevic, serving second, went 3-0 up with a brilliant forehand winner down the line.Djokovic came back to level at 4-4, but a mis-hit gifted Tipsarevic a set point on serve. Yet the 27-year-olds demonsreturned as he made another double fault and Djokovic eventually saw out the match with a forehand winner to clinch the tiebreak 8-6.It was a very tense second set, Djokovic said in a court-side interview. Towards the end, we both had chances and both got quite nervous and made some unforced errors.Weve known each other for a very long time and there are no secrets. Were very good friends, but were both professionals.