Lackey reinjures arm in fifth, leaves game

John Lackey, initially diagnosed with a right biceps strain after coming out in the fifth inning Saturday, will fly back to Boston for an MRI Sunday. Tom Szczerbowski/Getty Images

TORONTO -- John Lackey's return to pitching 17 months after undergoing reconstructive elbow surgery took an awful turn Saturday afternoon, when he reinjured his right arm and immediately left the game in the fifth inning.

The Red Sox announced that Lackey suffered a right biceps strain but did not specify the severity.

Lackey clutched his arm in agony after throwing a 2-2 pitch in the dirt to Toronto's Jose Reyes, who skipped over the pitch as it skittered to the backstop.

Second baseman Dustin Pedroia immediately came to Lackey's side as manager John Farrell and team trainer Rick Jameyson sprinted to the mound. Lackey walked off the mound to the dugout, his arm hanging at his side.

The 34-year-old right-hander, who had last pitched on Sept. 25, 2011, in New York, had been impressive Saturday afternoon, with a fastball that touched 94 miles an hour and an assortment of breaking balls and two-seamers that kept the Blue Jays off balance.

He struck out Emilio Bonifacio to open the fifth, his eighth strikeout of the game, but on a 2-2 curveball that Reyes fouled off, Lackey shook his arm in apparent discomfort. He then tried to break off a slider, with a gruesome result.

Alfredo Aceves replaced Lackey.