NEW YORK (AP) — Rafael Nadal was back at practice Monday, the day after a bout with leg cramps interrupted his post-match news conference at the U.S. Open.

In a scary scene during interviews following his win 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!”

Nadal plays his fourth-round match Tuesday afternoon against unseeded Gilles Muller.

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