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Ya, I just don't think its sustainable (line drive just over the wall).
Miguel Tejada has a 13.4 HR/FB% (15% in his prime), Alfonso Soriano has a 15.5% career mark. Their HRs go farther and they aren't handicapped by Safeco.
I don't think Lopez has minus power, just average, it just happens to be a bad match for the park. Lopez's 15-20 HRs mean a lot more than Dustin Pedroia's considering the park.