The St. Louis Cardinals lost a pitching prospect to retirement on Monday. The club announced on X that 20-year-old left-handed pitching prospect Bernard Mack returned from baseball after three seasons in the system. "LHP Bernard Mack (FCL) has retired," the Cardinals announced. LHP Bernard Mack (FCL) has retired. — Cardinals Player Development (@CardsPlayerDev) April 20, 2026 The Cardinals Lost A Pitching Prospect Feb 26, 2021; Jupiter, Florida, USA; A general view of the St. Louis Cardinals logo on the stadium at Roger Dean Stadium during spring training workouts. Mandatory Credit: Jasen Vinlove-Imagn Images | Jasen Vinlove-Imagn Images Mack signed with the Cardinals as a free agent back in 2023 out of the Dominican Republic. He made his professional debut the same year at 17 years old and appeared in 15 games in the Dominican Summer League. Over that stretch, he logged a 4.76 ERA and 23-to-11 strikeout-to-walk ratio in 17 innings pitched.…