Nascar Sprint Cup Series

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Driver Jimmie Johnson waits by his car before practice for Saturday's NASCAR Sprint Cup series auto race at Charlotte Motor Speedway in Concord, N.C., Friday, May 16, 2014. (AP Photo/Mike McCarn)

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Driver Jimmie Johnson waits in his car before practice for Saturday's NASCAR Sprint Cup series auto race at Charlotte Motor Speedway in Concord, N.C., Friday, May 16, 2014. (AP Photo/Mike McCarn)

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Drivers Matt Kenseth, left, and Kyle Busch talk before practice for Saturday's NASCAR Sprint Cup series auto race at Charlotte Motor Speedway in Concord, N.C., Friday, May 16, 2014. (AP Photo/Bob Jordan)

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Driver Brad Keselowski laughs with crew members before practice for Saturday's NASCAR Sprint Cup series auto race at Charlotte Motor Speedway in Concord, N.C., Friday, May 16, 2014. (AP Photo/Mike McCarn)

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Driver Kevin Harvick waits by his car before practice for Saturday's NASCAR Sprint Cup series auto race at Charlotte Motor Speedway in Concord, N.C., Friday, May 16, 2014. (AP Photo/Mike McCarn)

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Driver Carl Edwards talks to a crew member during practice for Saturday's NASCAR Sprint Cup series auto race at Charlotte Motor Speedway in Concord, N.C., Friday, May 16, 2014. (AP Photo/Mike McCarn)

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Team owner Richard Childress, front, and driver Austin Dillon, back, watch practice for Saturday's NASCAR Sprint Cup series auto race at Charlotte Motor Speedway in Concord, N.C., Friday, May 16, 2014. (AP Photo/Mike McCarn)