The team had feared that the injury was a hernia similar to the one that shut down second baseman Ian Kinsler for 12 weeks last year.
A magnetic resonance imaging Monday confirmed the diagnosis of the partial tear.
Tigers: : Part of Tiger Stadium's upper deck came crashing down, nearly a decade after the final major league game there and hours after a judge refused to stop the historic ballpark's demolition.
Rays: : Evan Longoria returned to Tampa Bay's starting lineup after missing nearly a week with an injured left hamstring.
Nationals: : The fireworks are coming back for Washington, days after debris from some pyrotechnics fell on the local fire chief as he watched a game.
District of Columbia Fire Chief Dennis Rubin ordered a halt to the fireworks after Sunday's game with the Mets. Team and fire officials met on Monday to review safety procedures.
Marlins: : Florida outrighted right-hander Hayden Penn to Triple-A New Orleans.
The Marlins acquired Penn (1-0, 7.77) in an April 1 trade with the Orioles for infielder Robert Andino.
Yankees 5, Rays 3: : Andy Pettitte recovered from two wild outings, Johnny Damon hit a tiebreaking home run in the sixth inning and New York defeated Tampa Bay.
Detroit won the opener with Brandon Inge singling in the go-ahead run in the ninth.
Marquis took the NL lead with his eighth win and Troy Tulowitzki homered for the first time in nearly a month as the Rockies completed their first sweep in St. Louis.
Marlins 4, Giants 0: : Sean West did not allow a hit until the seventh inning in his fourth career start and Brett Carroll hit his first career home run to help host Florida beat Randy Johnson and San Francisco.