Chris Sharma and Adam Ondra are arguably two of the best sport climbers in the world. So what happens when they go head-to-head, competing for the first-ascent of an unclimbed route? This video, from La Dura Dura, a preview of a full film which debuts at the Reel Rock Tour in September. The two don't seem too competitive—but then again, Ondra does throw a bit of a fit when he falls.