Andy Murray produced an excellent display as he beat Jo-Wifried Tsonga 6-4 6-1 to reach the quarter-finals of the Sony Open in Miami.
The British No 1 broke early in the first set to get the upper hand and, from that point, never relinquished control of the contest against his French opponent.
He served superbly throughout, not facing a single break point during the match, and eventually wrapped up victory in just 73 minutes.
Indeed, the only downside for the Scot was the fact he was forced to call the trainer midway through the first set. But, after a brief consultation, he did not require treatment and would continue showing no ill effects.
Having threatened the Tsonga serve in the opening game, Murray did break at the second time of asking as he opened an early 3-1 advantage.
He had chances in his opponent's next service game to extend the lead but Tsonga responded well to see off the danger.
It was in the following game that Murray appeared to pull up with more pain in his troublesome back, but still Tsonga was unable to make any impact on the Scot's serve.
Indeed, even after Murray's visit from the trainer at 4-3, the Scot was still able to come out and hold to love and would go on to serve for the set with the minimum of fuss.
Murray would then underline his dominance by breaking in the third game of the second set, dispatching a drive-volley forehand up the line to assume a 2-1 lead.
He would then move through the gears and, having held serve to move 3-1 ahead, won 14 points in a row to bring up three match points against a totally dejected Tsonga.
The Frenchman did end that run to deny his rival on his first match-point and then survived again after a challenge came back in his favour.
But it was merely delaying the inevitable and Murray closed out victory when his opponent netted an attempted backhand pass and he will now face Novak Djokovic in the next round.