Brad Keselowski, center, signs autographs before practice for Sunday's NASCAR Sprint Cup series Coca-Cola 600 auto race at Charlotte Motor Speedway in Concord, N.C., Thursday, May 22, 2014. (AP Photo/Mike McCarn)
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Brad Keselowski, center, signs autographs before practice for Sunday's NASCAR Sprint Cup series Coca-Cola 600 auto race at Charlotte Motor Speedway in Concord, N.C., Thursday, May 22, 2014. (AP Photo/Mike McCarn)
