Frias is not on the 40-man roster and has yet to make his MLB debut, but he's regarded as one of Arizona's better pitching prospects, sporting a mid-90s fastball and plus curveball. The right-hander excelled in short-season ball in 2019, posting a 1.99 ERA and 1.07 WHIP in 10 starts. The going got a little tougher for the 22-year-old upon a promotion to full-season ball, as he gave up 13 earned runs in 26.2 innings. There remain questions about Frias' command and third pitch, but the Diamondbacks made his development a priority with this move.
Diamondbacks' Luis Frias: Joins 60-man pool
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