"You would think," manager Bob Melvin said. "Hamstrings aren't something you want to mess around with. To what degree he strained it, I'm not sure."
Barton was considered likely to make the Opening Day roster as the second first baseman, but that could easily change should he miss an extended period of time. Most hamstring issues typically require at least a couple of weeks of rest.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.