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Mountcastle will play in this year's Arizona Fall League, Brittany Ghiroli of MLB.com reports.

Mountcastle, who has always shown promise offensively, recently made the switch from shortstop to third base, and the AFL will allow him to get more reps in at his new position. The 20-year-old hit .314 in 88 games with Frederick before being promoted to Double-A. Mountcastle will enter spring training with the skills to make the club, but with Manny Machado blocking the road, Mountcastle is still a couple years away from his MLB debut.

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