Castillo has been traded back to the Marlins with Colin Rea heading back to San Diego, Ken Rosenthal of Fox Sports reports.

EDGE Analysis

Rea will head back to San Diego as he left the game in his first start for the Marlins with an elbow injury. The Marlins were unhappy with the Padres, so it looks like they compromised by sending both players back to their respective teams. Castillo will head back to High-A Jupiter.