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The Marlins placed Simpson on the 15-day injured list Thursday with left elbow ulnar neuritis.

Simpson seemed likely to begin the season with a middle-relief role in the bullpen for Miami, but he dealt with elbow discomfort during spring training and will open the season on the IL. According to MLB.com, Simpson was able to throw last week while hitters stood in the batter's box, so it may not be long before he's ready to head out on a minor-league rehab assignment.

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