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2010 was actually worse than '09 when the BABIP is normalized.
Cust has a career .338 BABIP and 21.6 LD%. His '10 LD% was 21.8%, but his BABIP was 49 points over career norms.
I think its a combination of pitchers adjusting to him like Kotchman recently, and a more aggressive approach.
Until he goes back to his old ways, he really should be platooned.