When Boston acquired Andrew Bailey, it seemed like a great move.
The Red Sox found a shutdown closer to replace Jonathan Papelbon. All they really lost was a fringe prospect (Miles Head) and an outfielder who constantly failed to reach his potential (Josh Reddick).
For all his upside, Bailey deserved some caution. Injuries had been an issue in his career, and he had just 87 appearances over his previous two seasons.
Those injuries became the real crux of this trade, as Bailey made just 19 appearances for Boston in 2012, pitching to the tune of a 7.04 ERA and 1.891 WHIP.
Oakland, meanwhile, found fantastic return from both players.
Miles Head took steps forward in the power department, emerging as a top prospect in an already deep A's farm system.
Reddick enjoyed a tremendous breakout campaign with Oakland, notching career highs in home runs (32), RBI (85) and stolen bases (11).
He also played stellar defense, registering an 18.5 UZR while spending time in both right and center.
Even if Reddick sees some regression next season (he had a .305 OBP and 115 strikeouts), Oakland still comes out on top of this move.
One offseason later and Ben Cherington has already been forced to trade for a new closer—this time Pittsburgh's Joel Hanrahan—making this trade a monumental bust.