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...I predict a blizzard of hard hit balls. Not all of them HRs, but a 21.3 LD% in the NL where he gets to face pitchers 1 time in 9 is going to go up to 23 or 24% in the AL and he's going to have a BABIP of like .330 with a normal defense or .300 with the Mariners' defense. :)
Add onto that the flyball rate and even Safeco won't stop him from giving up 1.3 HR/9. He's too aggressive in the zone...he's basically Ryan Franklin with an extra K or two.