Single-A Fayetteville placed Pentecost on the 7-day injured list April 26 with forearm tightness, Geoff Pontes of Baseball America reports.
Analysis Pentecost is building back up in extended spring training. The 22-year-old righty logged a 4.24 ERA, 1.12 WHIP and 19 strikeouts in 17 innings across his first four pro appearances prior to the injury.