FanHouse Stanislas Wawrinka

Three weeks. That's all Andy Roddick is expected to miss with the knee injury that knocked him out of the Shanghai Masters last week in the middle of his first-round match.

It should still give him time to qualify for the season-ending ATP World Tour Finals in London in November.

"Results of the MRI [scan] showed a mild sprain of his medial collateral ligament of the left knee," said a statement on Roddick's website. "The news was very good for Andy. No surgery will be needed and Andy is expected to make a 100 percent recovery."

SHANGHAI (AP) -- Andy Roddick was forced to retire with left knee pain while leading Stanislas Wawrinka 4-3 Tuesday in the second round of the Shanghai Masters.

Roddick, who limped into the post-match news conference, quit after wasting a break point.

"I just felt I pushed off, and then Michael (Novotny, ATP trainer) came on court and did some tests and advised that it probably wasn't worth the risk," Roddick said.

Just how hurt is Rafael Nadal, anyway? He's not defending his Wimbledon title because his knees weren't at 100 percent. Now Nadal has been left off of Spain's Davis Cup team for next month's matches.

Spanish coach Albert Costa says Nadal "is not well." This was obvious to anyone who watched his exhibition match with Stanislas Wawrinka, a match which Nadal lost. There is no real shame in losing to Warwrinka, who just gave Andy Murray all he could handle in one of Wimbledon's best matches this year. Nadal, however, is (as of now) the world's No. 1 ranked player and thus isn't supposed to lose to anybody.

Nadal is suffering from tendinitis of the knees. As anyone with tendinitis knows, it's slow to get better, and that's assuming it ever does, said the writer, three seconds before he shook out his aching hand. Will Nadal ever get better? And what if he doesn't?