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Reigning US Open champion and second seed Andy Murray blasted nine aces en route to a 7-6 6-3 victory over Bulgarian Grigor Dimitrov in the third round of the Miami Masters.
Murray will face Italian Andrea Seppi in the fourth round, the 16th seed having beaten Brazilian Thomaz Bellucci in three sets.
Also advancing to the fourth round were eighth-seeded Frenchman Richard Gasquet, 6th seeded countryman Jo-Wilfried Tsonga and 10th-seeded Spaniard Nicolas Almagro.
In ladies play, China's Li Na reached the quarter-finals with a 7-6 6-2 win over Spanish teenager Garbine Muguruza.
She'll face world number one Serena Williams in the last eight - Williams coming from a set down to beat Slovakia's 13th seed Dominika Cibulkova 2 6 6 4 6 2.
Defending champ Agnieszka Radwanska defeated American Sloane Stephens 4-6, 6-2, 6-0 to reach the quarter-finals.
