Masha in doubt for Beijing

Tennis star Maria Sharapova moved to the box marked "tentative" for the Beijing Games, despite winning her second-round match at the Rogers Cup tournament in Montreal on Wednesday.

Sharapova beat Marta Domachowska, 7-5, 5-7, 6-2, and then withdrew from the tournament.

And, incredibly, it was not a knee injury.

Sharapova will have an MRI on her aching right shoulder, and the outcome of that test will likely determine her availability for the Olympics, as well as the subsequent U.S. Open.

Her absence in Beijing would be a big blow to the Russian team.

"At the end of the day, it's tough to go on court and not be close to even 50%," Sharapova said in a Canadian Press report. "I'm too good of a player to go out there and try to fight through something that I think can eventually become something serious."

-- Lisa Dillman

Photo: Maria Sharapova gets medical treatment to her shoulder during a Wednesday match against Poland's Marta Domachowska. Credit: Jacques Boissinot / Canadian Press