Ellsbury, Boston's speedy center fielder, led off the game with a single to center field. He stole second and wound up scoring on an RBI single by David Ortiz. In the second, Ellsbury flied to right.
The stolen base was the cause of the injury, but Ellsbury does not think it is serious. He also didn't rule out playing on Wednesday night against the Indians.
"It's better than it was," Ellsbury said. "It got real tight. It kind of went into a spasm. At that point, it was probably best to come out and give it a break."
The left-handed-hitting Ellsbury is batting .291 with one homer, nine RBIs and 15 stolen bases. Jonathan Van Every replaced Ellsbury in center field.
"I'll come in early [Wednesday], like I normally do -- get some treatment on it, and we'll see," Ellsbury said. "Considering how it felt earlier in the game, I feel pretty good."
Ian Browne is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.