PITTSBURGH — Chicago Cubs pitcher Jake Arrieta underwent an MRI on his achy right hamstring on Tuesday, and manager Joe Maddon says his team’s ace could have his next start pushed back.

Arrieta left with one out in the third inning of Monday’s loss to Pittsburgh after experiencing what he described as a cramp in the hamstring. Arrieta said afterward he felt fine, but the team opted for an MRI as a precaution.

Arrieta is scheduled to start on Saturday when the first-place Cubs host second-place Milwaukee at Wrigley Field. Maddon said it’s likely the team will exercise some caution regardless of the MRI results.

If Arrieta can’t go on Saturday, Chicago would likely use Mike Montgomery to fill in.

Arrieta had been 6-1 with a 1.59 ERA since the All-Star break before Monday’s shortened outing.


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