Andy Murray battles into US Open semi-finals

Andy Murray is through to the US Open semi-finals after defeating John Isner in four sets.

The first two sets proved relatively straightforward for the Scot, winning the first 7-5, and the second 6-4.

The big-serving American hit back in the third, winning 6-3.

The fourth set moved to a tie-break, with Isner not having lost a tie during the entire tournament, but Murray outplayed his opponent, winning 7-2.

The number four seed will face either Rafael Nadal after the Spaniard defeated Andy Roddick in straight sets.