U.S. Open 2011: Andy Roddick, Rafael Nadal, Donald Young Advance

After having successfully sat in the correct chair ten times in his third round match, Andy Roddick got a bit confused in the third set of his third round win over Julien Benneteau, and sat down in Benneteau’s chair.

↵The Frenchman walked over to the chair and shook Roddick’s hand, leading Roddick to at first think Benneteau was retiring from the match, but then to curse once he realized his error.

The marquee matches of Sunday’s U.S. Open action saw No. 2 Rafael Nadal and No. 21 Andy Roddick cruise into the fourth round. Nadal topped Argentina’s David Nalbandian 7(7)-6(5), 6-1, 7-5, while Roddick downed Julien Benneteau of France 6-1, 6-4, 7(7)-6(2).

Nadal will get Gilles Muller of Luxembourg next. You’ll hope Nadal recovers from whatever this was in time, or he may need to have the match relocated to his lair beneath the press conference table, which you’ll be impressed to learn is regulation size.

Typically, athletes cramp during competition. Rafael Nadal waited for the press conference after his win at the 2011 U.S. Open on Sunday.

If you can make it through that video without giggling uncontrollably, you are a far stronger person than I. Nadal is fine, and did his press conference standing, but him slipping off a chair and eventually laying on the floor while being attended to by a trainer certainly made for a memorable moment.

Rafael Nadal and Andy Roddick are back in action on Sunday at the US Open, taking the court for third-round matchups. Roddick faces Julien Benneteau to keep his US Open dream alive while Nadal squares off against David Nalbandian. The two highlight a day full of tennis, beginning bright and early on Sunday morning.

Here’s a few of the matchups to watch.