He still raced with a suspected compressed disk, along with lacerations to his face, but was still good enough to take the lead.
His last competitive outing was a win in the prestigious Green River race in North Carolina last month, after a season dominated by extreme race wins and his debut at the London Olympics.
First stage results: Whitewater Enduro:
Men: Mike Dawson (NZL) 4:22.89 1, Isaac Levinson (USA) 4:27.61 2, Dane Jackson (USA) 4:33.40 3, Evan Garcia (USA) 4:34.41 4, Michele Ramazza (ITL) 4:36.69 5, Eric Deguil (FRA) 4:36.90 6, Jakub Nemec (CZE) 4:37.27 7, Todd Wells (USA) 4:40.40 8, Marcos Gallegos (CHL) 4:46.26 9, Ben Marr (CAN) 4:47.43 10.
Women: Nouria Newman (FRA) 5:00.76 1, Martina Wegman (NLD) 5:08.55 2, Katrina Van Wijk (CAN) 5:25.82 3, Natalie Anderson (USA) 5:33.64 4, Louise Jull (NZL) 5:41.14 5, Lu Urwin (NZL) 5:45.83 6.