Andy Murray did enough to beat France’s Florent Serra in straight sets on Friday, but it was a less than convincing performance from the Scot.

22-year-old Murray beat Serra 7-5 6-1 6-4 to progress to the fourth round, and while he is yet to drop a set in Melbourne, the game was tight at times.

Serra came back from 3-0 down in the first set before the number five seed fought hard to take it 7-5, while the third set was also a tight affair.

“I'm happy to have won in three sets in all of the matches,” said Murray afterwards. “It's important to have tight situations in matches like the first set today where, it got quite close at points.

"Against [Marc] Gicquel, like in the third set, it got close. Came through all the sort of tough moments in the match, as well. But I'm happy to save as much energy as possible. Today was hot. So it was nice to get off the court quickly.”

Murray, 5/1 to win the Men's singles and still on course for a showdown with Rafael Nadal next week, will next play American John Isner, who beat Gael Monfils 6-1 4-6 7-6(4) 7-6(5).

Isner, who as we warned in our pre-match betting preview could cause problems with his serve, overpowered the Frenchman, who made a show start to the match and paid the price for not matching the big-serving American's aggression.

“I want to try and get through the next match,” Murray said ahead of his fourth round match. “Isner is playing really well. The guy is 6'9" (and) has (one of the best) if not the best serve on the tour.”

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