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The Mazzaro and O’Sullivan competition for the final rotation slot could continue beyond spring training. Both could start the season with Triple-A Omaha to keep on a regular routine until the Royals need a fifth starter.

Nate Adcock, a Rule 5 pick from the Pittsburgh Pirates, has not allowed a run and only seven hits in eight innings. He has been primarily a starter in the minors, but the 23-year-old right-hander has not pitched above Class A. If he makes the staff, it will likely be as a long reliever to begin the season.