"It's more frustrating than anything," Burnett said. "I was throwing the ball well. There are no answers yet, and hopefully [Monday] I'll feel better."
Burnett entered the game in the seventh inning and left after George Kottaras grounded out and Chris Getz beat out an infield single. Burnett slid at the bag while covering first on the Getz single, but the injury was not related to that.
Robert Falkoff is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.