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His FB% is at 41.4% this year. His HR/FB% is10.3%.
I think the FB% is sustainable, but I don't think the HR/FB% is. Lopez is much better off hitting the ball in the air though.
The average distance of Lopez' HRs this year is 381.7.
IIf Lopez can maintain the high FB% than he'll still hit 15-20 HRs year and may pop 20HRs another year, but this may end up being a career high HR year.