Trevor Bayne's No. 21 Ford has blown a left-front tire to draw the caution flag with fewer than 20 laps remaining in the Pure Michigan 400.
Paul Menard, Landon Cassill, and Travis Kvapil had not yet pitted when Bayne blew the tire and smacked the wall, so they have hit the pits under the caution.
Brad Keselowski is now in the lead ahead of Jimmie Johnson, Kasey Kahne, Dale Earnhardt Jr., and Greg Biffle. The top-10 is completed by Carl Edwards, Marcos Ambrose, Martin Truex Jr., Clint Bowyer, and Kyle Busch. Sam Hornish Jr., who had been in the top-10 for much of the day after not turning a single lap in the car until this afternoon due to his Nationwide Series obligations in Montreal, was forced to pit under the yellow with a vibration - likely a loose wheel - from his most-recent stop.
Keselowski is looking for what would no doubt be an emotional victory at his home race track. The Rochester Hills, MI, native got ahead of Johnson - who is seeking his first MIS win - during the cycle of pit stops much to the bewilderment to Johnson and his crew chief Chad Knaus. Keselowski's own pit boss Paul Wolfe has proven adept at strategy calls that have given his driver a better position in the running order.