This time it was Scott Podsednik, who had to leave Sunday night's 7-4 victory over the Cubs with a mild left groin strain.
The good news is that the injury appears to be minor. The Red Sox have an off-day on Monday.
"I'm feeling fine," Podsednik said. "A little tweak in the groin. It's not serious. Day off tomorrow, hopefully I should be ready to get back into action come Tuesday or Wednesday."
When he hit into an inning-ending 4-6-3 double play in the top of the fifth, Podsednik limped down the line.
It turns out he sustained the injury in his previous at-bat, grounding out to shortstop in the third.
"He came up short at first," said Red Sox manager Bobby Valentine. "I didn't check him and I should have. Then I told [bench coach Tim Bogar] we have to watch him here -- he came up short and didn't say anything. He didn't run on the double play at all."
When the Red Sox went out for defense in the bottom of the fifth, Daniel Nava replaced Podsednik.
Podsednik opened Sunday's game with a single to center and then scored on a double by Dustin Pedroia.
He has been a feel-good story since being summoned from Triple-A Pawtucket on May 22. After years as a solid Major League player, Podsednik had been relegated to the Minor Leagues since the start of the 2010 season.
Podsednik is hitting .387 with one homer and seven RBIs for Boston.
The Red Sox have been besieged by injuries in the outfield all season. Carl Crawford has yet to play in 2012, thanks to left wrist and elbow issues.
Jacoby Ellsbury hasn't played since April 13 because of a subluxation in his right shoulder. Cody Ross has been on the disabled list with a fractured navicular bone in his left foot, but might be ready to be activated on Tuesday.
Ryan Sweeney went on the disabled list before Sunday's game with a left big toe injury.