The Rockies have acquired minor-league righty Jon Keller from the Orioles, per an official announcement. He’ll become the player to be named later in the April swap that sent right-hander Miguel Castro to Baltimore.

Keller, 25, has yet to move past the Double-A level through five seasons in the minors. Though he has had some intriguing moments at times in the lower minors, he has stalled out with command issues at Bowie. Over 53 total frames there since 2015, Keller owns a 7.13 ERA with 41 strikeouts and 51 walks.

Meanwhile, Castro — once seen as an intriguing prospect — has produced for the O’s this year.