Double-file restarts pump new life into NASCAR

Denny Hamlin bumped Jimmie Johnson, knocking him out of the lead.

Johnson hit Kurt Busch, sending him banging into wall. Busch, angry at Johnson, swerved down the track and hit him back, nearly taking out a host of cars in the process.

Meanwhile, Hamlin and Brian Vickers, both winless this season, waged war at the front of the field, locking horns and trading paint, sending them both slipping up the track and out of the groove.