Indianapolis received the fourth round of the AMA Supercross, part of the FIM World Championship.
Justin Barcia (USA and Malcolm Stewart (USA) fell in the first lap. Eli Tomac (USA) took the lead in front of Adam Cianciarullo (USA) and Ken Roczen (DEU) but it was short-lived as he made a mistake in a curve and fell to the third.
A few minutes later Tomac kept pressing and made a group of three pointers. Roczen felt the pressure but fought it by taking the lead.
On the next lap, with nine laps to go, Cianciarullo fell, leaving Roczen and Tomac in a duel.
This time Roczen made a mistake when Tomac was going to pass him and gave up the position. Cooper Webb (USA) passed Cianciarullo for third.
Roczen passed Tomac again with two laps to go and although the Champion put pressure on the last lap, this time there would be no change in positions.