Sixteen nations secured entries announced Thursday, with two spots remaining in the mixed team event. The U.S. features four Top 20 players.

“We knew it (a transition) would eventually come sooner or later, and it looks like it was later,” said John McEnroe.

The German is out of the Davis Cup Finals after enduring a bone edema, which he says will push returning back for "weeks or most likely even months."

It's hard to believe that some of today's top pros once had to qualify—and often together.

After suffering an injury at Roland Garros, the German won't participate in the US Open, but his season may not be over.

The German will miss the year's last Grand Slam while recovering from surgery on his right ankle, while American No. 3 Reilly Opelka has also withdrawn from the tournament.

"I want to encourage children with diabetes, to never give up on their dreams no matter what others might say to you," he said in an announcement.

While Rafael Nadal has confirmed he plans to try to play Wimbledon, a few other names have been announcing their withdrawals from the grass-court Grand Slam.

The best players recognize that they have no precious energy of any kind to waste in the throes of a competitive five-setter.

For the first time since November 2003, none of the Big 3 are in the Top 2. Also, Casper Ruud cracks the Top 5.