"Jason Giambi's second season with the Rockies appears to be finished.

Giambi strained his left biceps tendon Sunday when he swung at a Matt Cain pitch in the ninth inning. He grimaced at the plate as the bat flew out of his hands and hit the ground.

"He felt it," Rockies manager Jim Tracy said. "I leaned over and whispered to my bench coach (Tom Runnells), 'He hurt himself.' Have you ever seen him take a swing and the bat come flying out of his hand? He tweaked something in there."

Giambi is scheduled to undergo an MRI, but all signs point to him being shut down. If so, he'll walk away with a .244 batting average with six home runs and 35 RBIs in 176 at-bats. He's also tied for the team lead with two pinch-hit homers.

Giambi, who turns 40 in January, was receiving treatment and was unavailable for comment. But he said a few weeks ago that he would like to return in 2011 if the Rockies want him.

"I've had a blast," Giambi said. "Absolutely, I'd like to come back. I'd like to play another two or three years if I can.""