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Oakland acquired five prospects and a scrub who had just surpassed rookie eligibility for Haren, the staff ace, and Robertson, a fringe MLB reliever. By the magic of Billy Beane, the A's came out as the clear victors.
Every prospect played for the A's in the majors, and aside from outfielder Aaron Cunningham, all developed a regular role.
Current long-relief man Brett Anderson came over from the Arizona Diamondbacks, as did Chris Carter, who slugged 16 home runs in a platoon role during the A's 2012 playoff run.
Carlos Gonzalez hit 22 doubles in 302 at-bats while manning center field for the 2008 A's. Gonzalez had a promising combination of power and speed, but was dealt to the Rockies in the ill-advised Matt Holliday trade.
Greg Smith and Dana Eveland, who came over with a whopping 64.1 major league innings under his belt, each had one mediocre season in the A's rotation.
The A's dealt Haren when he was just 27 years old, so he had four good seasons for the D-Backs and Angels before bombing with the Washington Nationals. Robertson threw seven innings for Arizona in 2008 and quit baseball two years later.
Of course, the A's wouldn't have landed Haren in the first place were it not for another trade...