Reigning US Open champs Andy Murray and Serena Williams stepped up their bids for another title while China's Li Na halted the giant-killing run of a Spanish teen to advance at the Miami Masters.
Andy Murray returns a shot to Grigor Dimitrov during the Miami Masters on March 25, 2013. The second seed Murray, who won this event four years ago, needed one hour and 54 minutes to oust the 29th-seeded Dimitrov.
Second seed Murray blasted nine aces en route to a 7-6 (7/3), 6-3 victory over disgruntled Grigor Dimitrov to reach the fourth round of the hardcourt tournament.
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