Six years ago, when the Cincinnati Reds were in the middle of a rebuild, they traded a middle of the rotation starter for a young prospect in Luis Castillo.
Castillo broke out and developed into a two-time All-Star, leading the Reds rotation for most of his career. Despite his success, the Reds are moving on toward another rebuild.
More:Nightengale: The Reds are driving the trade deadline. Time for front office to show a plan
The Reds traded Castillo to the Seattle Mariners on Friday night for four minor leaguers, including the Mariners' top two prospects, according to Baseball America's rankings.