Andy Murray battled through a hard-fought clash with Spaniard Feliciano Lopez to move into the last 16 at the US Open.

The Scot scraped through three tie breaks, eventually winning 7-6 (7-5), 7-6 (7-5), 4-6, 7-6 (7-4).

Murray said: "It was a very, very tough match. I just had to keep fighting. It was very hot and humid in the middle part of the match and I was struggling a little bit with that. But I thought we played some good tennis, especially at the end of the sets."

Murray will play either Milos Raonic or James Blake in the last 16.

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