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Melbourne - Andy Murray beat Portugal's Joao Sousa 6-1, 6-1, 7-5 at the Australian Open on Friday to set up a 4th round clash with Grigor Dimitrov.
The sixth-seeded Murray is attempting to become the first man to win the Australian Open after losing three times in the final. He lost to Novak Djokovic in 2013 and 2011 and Roger Federer in 2010.
His next match against the 10th-seeded Dimitrov will be a reprise of their Wimbledon quarterfinal last year, won by the Bulgarian.
With coach Amelie Mauresmo watching from the stands, Murray has yet to drop a set at Melbourne Park.
He said, "I've played three quite quick matches, which helps. You expect with every round they're going to get a little longer, tougher on the body."
