Driver Denny Hamlin (11) and Brad Keselowski (2) lead the field to start the NASCAR Sprint Cup series auto race at Bristol Motor Speedway on Sunday, March 16, 2014, in Bristol, Tenn. (AP Photo/Wade Payne)
Brad Keselowski drives during qualifying for Sunday's NASCAR Sprint Cup Series auto race on Friday, March 7, 2014, in Las Vegas. (AP Photo/Isaac Brekken)
Brad Keselowski comes out of Turn 4 during a NASCAR Sprint Cup Series auto race on Sunday, March 9, 2014, in Las Vegas. Keselowski won the race after passing Dale Earnhardt Jr. on the last lap. (AP Photo/Julie Jacobson)
The pit crew for Brad Keselowski celebrates after winning the Kobalt 400 NASCAR Sprint Cup Series auto race on Sunday, March 9, 2014, in Las Vegas. (AP Photo/Julie Jacobson)
Brad Keselowski pulls out of pit row as his pit crew members finish changing his tires during a NASCAR Sprint Cup Series auto race on Sunday, March 9, 2014, in Las Vegas. Keselowski won the race. (AP Photo/Julie Jacobson)
Brad Keselowski drives during a NASCAR Sprint Cup Series auto race Sunday, March 9, 2014, in Las Vegas. Keselowski won the race. (AP Photo/Isaac Brekken)
Brad Keselowski celebrates in victory lane after winning a NASCAR Sprint Cup Series auto race, Sunday, March 9, 2014, in Las Vegas. (AP Photo/Isaac Brekken)