Tigers send top prospect Nick Castellanos to Triple-A

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Nick Castellanos had a good spring, but the 21-year-old top prospect never really had a chance of making the Tigers and yesterday they assigned him to Triple-A.

Castellanos has ranked among Baseball America‘s top-100 prospects for three straight seasons, rating No. 21 overall this year, and while there wasn’t a place for him on the Opening Day roster Jason Beck of MLB.com writes that “he shouldn’t be [at Triple-A] for long.”

Castellanos has shifted from third base to the outfield and specifically now left field, and while very promising he’s played just 79 games above Single-A and zero games at Triple-A. And last season he struggled at Double-A, hitting .264 with a .678 OPS and 76/14 K/BB ratio. He was 20 years old, so that’s hardly an indictment of his long-term potential, but if the Tigers think Castellanos is ready to make a big-league impact in the second half that would be plenty fast.

Marlins designate Derek Dietrich for assignment

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The Marlins designated utilityman Derek Dietrich for assignment, Clark Spencer of the Miami Herald reports. This comes amid a flurry of moves on Tuesday night as teams prepare their rosters ahead of the Rule 5 draft next month.

Dietrich, 29, is coming off another strong season in which he hit .265/.330/.421 with 16 home runs, 45 RBI, and 72 runs scored in 551 plate appearances. He played all over the diamond, spending most of his time in left field and at first base. Dietrich also played some second base, third base, and right field.

Dietrich is entering his third of four years of arbitration eligibility. He earned $2.9 million this past season and MLB Trade Rumors projects him to earn $4.8 million in 2019. Cutting Dietrich represents a bit more than 4 million in savings for the rebuilding and perennially small-market Marlins. Dietrich should draw some interest, so the Marlins could end up trading him rather soon.

Wonder how J.T. Realmuto, now the longest-tenured Marlin, is feeling right about now.