Brad Keselowski prepares for practice for Sunday's NASCAR Sprint Cup series Coca-Cola 600 auto race at Charlotte Motor Speedway in Concord, N.C., Thursday, May 23, 2013. (AP Photo/Chuck Burton)

Associated Press
Brad Keselowski prepares for practice for Sunday's NASCAR Sprint Cup series Coca-Cola 600 auto race at Charlotte Motor Speedway in Concord, N.C., Thursday, May 23, 2013. (AP Photo/Chuck Burton)
Brad Keselowski prepares for practice for Sunday's NASCAR Sprint Cup series Coca-Cola 600 auto race at Charlotte Motor Speedway in Concord, N.C., Thursday, May 23, 2013. (AP Photo/Chuck Burton)
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