Sara Errani

Serena Williams' shoulder 'feels solid,' looks even better

So about that inflamed right shoulder that was supposed to hinder Serena Williams at the U.S. Open as she seeks a record 23rd major title: It sure seems to be just fine.

"Definitely feels solid," Williams said.

Not sure? There's plenty of evidence. No need to take her word — or her coach's — for it.

Look at the way Williams beat 47th-ranked Johanna Larsson 6-1, 6-1 on Saturday to reach the fourth round at Flushing Meadows and collect the 307th Grand Slam match victory of her career, surpassing Martina Navratilova for most by a woman in the Open era and equaling Roger Federer for most by anyone since 1968.

Williams reached 121 mph on a...