New York, Sept. 2 -- Rafael Nadal breezed into the third round of the U.S. Open, as the defending champion was two sets to the good when Nicolas Mahut retired on Friday.

Mahut elected to serve and volley, offering Nadal a different challenge to what he normally faces, but it made no difference as the Frenchman only turned himself into a target at the net for Nadal to pass.

The Spaniard, who has not been at his best this season, crunched 24 winners and broke serve on four occasions as he secured safe passage into round three in a shade over an hour and a quarter.

Rafael Nadal of Spain hits balls in the crowd after after his opponent Nicolas Mahut of France retired with an injury at the U.S. Open tennis tournament in New York, September 2, 2011.

Andy Murray overcame a two-set deficit to defeat Robin Haase and advance to the third round with a 6-7(5), 2-6, 6-2, 6-0, 6-4 victory.

The fourth-seeded Murray led 4-0 in the fifth set but Haase won four straight games.

Serving at 5-4, Murray had match point and Haase hit a forehand that was called out. Haase challenged and the replay showed the ball barely clipped the line.

But Murray answered with a pair of service winners on the next two points to close out the match.

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