Andy Murray initially couldn't figure out what the strange noise was but eventually he was speaking loudest with his racket.
The rain clanking on the roof of Arthur Ashe Stadium was just a minor distraction as the second-seeded Murray posted a 6-4, 6-1, 6-4 victory over Marcel Granollers in men's second-round play on Thursday at the U.S. Open in Flushing, N.Y.
Murray and Granollers were playing indoors while the rest of the tennis complex was being pounded by fierce rain that caused delays for the outdoor matches.
"At first we didn't know if there was just more people coming in at the change of ends, but then we quickly realized it was the rain," Murray said after the match. "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."
The Englishman experienced some struggles before putting away Granollers in straight sets.
He committed 28 unforced errors and only converted on 43 percent of his first serves.
Murray also had to stave off a big charge from the Spaniard after opening up a 5-2 lead in the opening set. The next two games took nearly 23 minutes with Granollers winning both before Murray finished off the set.
"It was tough obviously, had it gone to 5-5 then the first set becomes a really tough one and all the pressure is on me at the end of that set," Murray said. "Thankfully I got through that 5-4 game and the momentum was back with me."
Murray regained control and dominated the second set before cruising through the final set.
Murray will face either France's Gilles Simon or Italy's Paolo Lorenzi in the third round.