John Isner is through to the fourth round of the Miami Masters, thanks to a straight-sets win over Grigor Dimitrov.
The Bulgarian struggled to cope with Isner's powerful serve in the first set, and a tie-break looked likely from the opening game.
The American upped his performance in the tie-break, and forced a couple of Dimitrov errors with some fine ground strokes to take the set 7-6.
Isner capitalised on his momentum at the beginning of the second set with an early break of serve, and a Dimirov double-fault handed him a second break a few games later.
An ace down the middle confirmed victory for Isner, who will meet Milos Raonic in the next round.
