Whether it's the thumping music, the rowdy spectators or the aroma of marijuana, maintaining concentration presents a huge challenge for players at the world's most raucous Grand Slam.

"There's a lot of noise this year," said France's Adrian Mannarino.

Mannarino, 37, who is playing in the main draw at Flushing Meadows for the 15th time, wondered whether the distractions are too much.

"I find it's a bit of a circus on the court: people move between games, sometimes between points. We let everything happen a little too much. It's still tennis, not football!" he said.

Mannarino was speaking after his second round match on the USTA Billie Jean King National Tennis Center's Court 11, where noise from the giant, 23,859-capacity Arthur Ashe Stadium nearby -- the largest arena in tennis -- can

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