Andy Murray cruises into US Open third round with straight sets win over Marcel Granollers

Andy Murray had to play through a deafening downpour on his way to victory over Marcel Granollers and a place in the US Open third round.

Murray's match was put under the 150million roof in Arthur Ashe Stadium but a combination of echoing chatter and torrential rain outside still made conditions a challenge.

The British number one, however, wavered only momentarily as he beat Granollers 6-4 6-1 6-4 to book his place in round three. He will now face either France's Gilles Simon or Italian Paolo Lorenzi.

This was not a vintage Murray performance. He made 28 unforced errors and his first serve only landed 43 per cent of the time, but another straight-sets win will preserve energy for sterner tests to come.

There was also the challenge of playing under the roof, which amplified an already noisy New York crowd and for a while caused a clattering din as the rain poured down top.

"At first we didn't know if there was just more people coming in at the change of ends, but then we quickly realised it was the rain," Murray said.

"It was tough, you couldn't really hear the ball which makes it tricky. But we're lucky to play under the roof; otherwise there wouldn't be any tennis so it's good for everyone."