Andy Murray in trouble, and so is his opponent

 The CBS broadcast is done for the day, right in the middle of the best match of the day. No. 4 seed Andy Murray is in a fierce battle with No. 25 Stanislas Wawrinka; they each took a set in a tiebreak, and Wawrinka is up 4-1 in the third, with Murray serving at 40-15.

Except the Swiss upstart needed a medical timeout to get treatment on what appears to be a right quad injury. He's now back on the court, trying to pull off a pretty big upset, considering how well Murray has been playing coming into the Open.

Wawrinka, the second-best Swiss player on the men's circuit -- behind some guy called Federer -- is coached by Peter Lundgren, who was Federer's coach when he broke through several years ago.