"Jon Lester has a strained lower left latissimus, a large muscle that runs beneath the shoulder. Terry Francona said the lefthander will be examined tomorrow.

"We'll certainly get him checked out extensively tomorrow," he said. "The good sign of it, I think, is that he didn't do it on one pitch. Between innings, it felt like it was cramping on him. There's now way we're going to let him pitch."

Lester said he was not concerned and did not see the injury as a long-term issue. But obviously more will be learned tomorrow. Lat strains can last as quick as two weeks (that was the case for Matt Albers earlier this season) or as long as several months."