Sprint Cup

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Kevin Harvick celebrates in Victory Lane after winning the NASCAR Sprint Cup auto race at Darlington Raceway in Darlington, S.C., Saturday, April 12, 2014. (AP Photo/Chuck Burton)

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Ryan Newman's crew works on his car during a pit stop in the NASCAR Sprint Cup auto race at Darlington Speedway in Darlington, S.C., Saturday, April 12, 2014. (AP Photo/Chuck Burton)

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Joey Logano (22) races Jeff Gordon (24) during the NASCAR Sprint Cup auto race at Darlington Speedway in Darlington, S.C., Saturday, April 12, 2014. (AP Photo/Chuck Burton)

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The field takes the green flag to start the NASCAR Sprint Cup auto race at Darlington Speedway in Darlington, S.C., Saturday, April 12, 2014. (AP Photo/Chuck Burton)

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Driver Kurt Busch (41) drives through turn four as Marcos Ambrose (9) follows during a NASCAR Sprint Cup auto race at Martinsville, Speedway in Martinsville, VA., Sunday March 30, 2014. (AP Photo/Mike McCarn)

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Clay Campbell, left, president of Martinsville Speedway celebrates in victory lane with race winner Kurt Busch, right, Patricia Driscoll, Busch's girlfriend and her son, Houston after a NASCAR Sprint Cup auto race at Martinsville, Speedway in Martinsville, VA., Sunday March 30, 2014. (AP Photo/Mike McCarn)

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Driver Kurt Busch celebrates in victory lane after winning a NASCAR Sprint Cup auto race at Martinsville, Speedway in Martinsville, Va., Sunday March 30, 2014. (AP Photo/Steve Shappard)

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Kevin Harvick (4) pulls off pit road as his crew members wave before the start of a NASCAR Sprint Cup auto race at Martinsville, Speedway, Sunday, March 30, 2014, in Martinsville, Va. (AP Photo/Mike McCarn)