Boston pitcher Josh Beckett threw a side session Thursday during an off-day in the Red Sox-Angels playoff series, and remains scheduled to start Game 3 Sunday in Boston.

Beckett, originally scheduled to start Game 1, injured a muscle in his side last Friday during a bullpen session.

"He ended up with 67 pitches, which is a pretty aggressive side, but I think we probably needed to do that," Red Sox manager Terry Francona said. "We'll monitor him as we go, but the medical people were out there and I think we were very pleased with the way things went."

The Red Sox lead the series 1-0 going into Friday night's game in Anaheim.