Celebrating his 75th AMA Supercross win in style , Ken Roczen kept his powder dry for a bunch of laps , sitting and planning lines before unleashing and hitting the front , passing the leading trio in four laps before checking out . Knowing that he had to make a gap before the others could launch a counterattack using those same lines , it was time to pin the ears back and snap the elastic band and pull off what he described as ‘ definitely up there as one of my best main event wins ever . It ’ s pretty surreal .’ Cooper Webb was second and still retains the series lead with 168 points , ahead of Chase Sexton on 158 and Roczen closing in with 152 points in third .