Single-A Charleston activated Gray (elbow) from the 7-day injured list Tuesday.
Gray wound up missing nearly two months due to midseason elbow surgery but has completed a two-week rehab assignment in the rookie-level Florida Complex League. The 18-year-old was taking the minor leagues by storm before going down, as he's slashing .275/.394/.456 with six home runs, three doubles, four triples, 30 RBI and four stolen bases over 198 plate appearances for Charleston.