NEW YORK (AP) Rafael Nadal is back on his feet after a scary moment at his post-match news conference at the U.S. Open, when painful leg cramps made him slip to the floor.

Reporters were cleared out of the interview room as Nadal received treatment Sunday. After about 10 minutes, they were allowed back in, and Nadal told everyone, ``I just have cramping in my leg. That's all.''

Nadal was in the middle of the Spanish portion of his news conference when he leaned back in obvious pain, his arm over his face. After receiving treatment and making a statement in English, he resumed his Spanish interviews.

The defending champion had earlier overcome a blister on his right foot and two tight sets to beat 2002 Wimbledon runner-up David Nalbandian 7-6 (5), 6-1, 7-5 and reach the fourth round on a hot afternoon.