Brad Keselowski

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Brad Keselowski holds up the Kobalt 400 trophy after winning a NASCAR Sprint Cup Series auto race on Sunday, March 9, 2014, in Las Vegas. Keselowski overtook Dale Earnhardt Jr. on the last lap when Earnhardt ran out of fuel. (AP Photo/Julie Jacobson)

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Brad Keselowski celebrates after winning a NASCAR Sprint Cup Series auto race on Sunday, March 9, 2014, in Las Vegas. Keselowski overtook Dale Earnhardt Jr. on the last lap when Earnhardt ran out of fuel. (AP Photo/Julie Jacobson)

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A pit crew member reaches to grab one of the used tires off of Brad Keselowski's car during a pit stop at a NASCAR Sprint Cup Series auto race on Sunday, March 9, 2014, in Las Vegas. (AP Photo/Julie Jacobson)

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Brad Keselowski (22) pits during the NASCAR Nationwide Series auto race Saturday, March 8, 2014, in Las Vegas. Keselowski won the race. (AP Photo/Isaac Brekken)

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Brad Keselowski (22) leads during a caution period in the NASCAR Nationwide Series auto race Saturday, March 8, 2014, in Las Vegas. Keselowski won the race. (AP Photo/Isaac Brekken)

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Brad Keselowski (22) leads Kyle Busch (54) during the NASCAR Nationwide Series auto race Saturday, March 8, 2014, in Las Vegas. Keselowski won the race. (AP Photo/Isaac Brekken)