Carlos Rodon, their designated ace, will undergo Tommy John elbow surgery and be out for a year, joining top pitching prospects Michael Kopech and Dane Dunning on the shelf.
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Outfielder Eloy Jimenez, who signed a guaranteed six-year, $43 million deal before his first major-league game, is beginning his rehab from a sprained ankle at Triple-A Charlotte after an up-and-down first 23 games.
Daniel Palka and Adam Engel, regulars in 2018, have been demoted to the minors.