Drafted in the 11th round (330th overall) by the Arizona Diamondbacks in 2014 (signed for $150,000).
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Miller moved into the rotation this spring after two years in Vanderbilt's bullpen. He touched 93 mph early in the spring and was getting attention in the top few rounds, but his stuff backed up and he ceded his rotation spot down the stretch. The 6-foot-7, 240-pounder has a strong and physical build. In the rotation, he worked at 88-92 mph at his best but fell to 86-88 later in the season. His breaking ball is ahead of his changeup, and both show average potential. Miller faces questions about his strike-throwing ability after walking 4.3 per nine in his career and 3.9 this season. His herky-jerky delivery offers some deception. Miller is one of the younger college players in the class and won't turn 21 until the end of the minor league season.
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In the offseason following the 2015 season, Miller picked the brain of fellow lefthander and Vanderbilt product David Price and came away with a new weapon. Miller's newfound cutter was the pitch that pushed him over the top and helped him catapult onto the D-backs' prospect landscape with a dominant 2016. He then arrived at big league camp in 2017 but struggled with his command, which is an issue that carried over to the start of the Double-A season. Coaches say Miller cleaned up the direction in his delivery and started mixing in more curveballs, and from May through the end of the season he posted a 1.69 ERA with 80 strikeouts in 58.2 innings. Miller uncorks his 6-foot-7 frame in a high-effort delivery, and all of his pitches, including a low- to mid-90s fastball, have good life. Opinions on Miller vary in the scouting community. Some scouts see a potential late-inning reliever and possible closer, while some see him as a left-on-left matchup type. Still, other scouts are concerned about Miller's command, noting that he seemed to struggle against lineups that waited him out. On the heels of another impressive season, Miller could work his way to the big leagues in 2018, although a start at Triple-A Reno isn't out of the question.
Miller was part of the Vanderbilt pitching staff during the Commodores' 2014 College World Series championship season. A college roommate of 2015 Diamondbacks first-rounder Dansby Swanson, he pitched both as a starter and in relief and got the win in the first game of the 2014 CWS Finals. The Diamondbacks took the hulking lefthander in the 11th round that year and signed him for an over-slot $150,000 bonus. Miller's career took off in 2016 after Arizona moved him to the bullpen. He zoomed through four levels of the organization and finished the season at Triple-A Reno before being one of the big surprises of the Arizona Fall League. He allowed no runs and just six hits in 18.1 innings with 30 strikeouts and four walks. Miller's funky, max-effort delivery has him falling to the third-base side but adds deception and doesn't affect his control. He uses a fastball with plus movement in the 92-94 mph range, but the jewel of his arsenal is an 83-88 mph slider with great tilt and depth that flashes plus and gets plenty of swings and misses. Miller's third pitch is a 77-83 mph curveball. While not yet on the 40-man roster, he has a good chance of getting to Chase Field at some point in 2017.
Draft Prospects
Miller moved into the rotation this spring after two years in Vanderbilt's bullpen. He touched 93 mph early in the spring and was getting attention in the top few rounds, but his stuff backed up and he ceded his rotation spot down the stretch. The 6-foot-7, 240-pounder has a strong and physical build. In the rotation, he worked at 88-92 mph at his best but fell to 86-88 later in the season. His breaking ball is ahead of his changeup, and both show average potential. Miller faces questions about his strike-throwing ability after walking 4.3 per nine in his career and 3.9 this season. His herky-jerky delivery offers some deception. Miller is one of the younger college players in the class and won't turn 21 until the end of the minor league season.
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Rated Best Slider in the Arizona Diamondbacks in 2018
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