Rafael Nadal was back at practice on Monday, the day after a bout with leg cramps interrupted his post-match news conference at the US Open.

In a scary scene during interviews following his win on Sunday, Nadal started grimacing and slipped out of his chair while calling for a trainer. After receiving brief treatment, he was smiling, saying it was nothing more than leg cramps.

On Monday, the defending champion posted a picture from his practice session on his Facebook page, along with the message: "Hi, after yesterday's incident, that you all know, and all the mess around, I share a picture of today's practice (almost 2 hours). Now waiting to know the time I play. Thanks everybody for your support!"

The prediction of cooler weather and possibility of showers should make life easier for the Spaniard when he meets Gilles Muller of Luxembourg for a place in the quarterfinals.