Kyle Skaggs (23) wins Hardrock 100 Mile Endurance Run by over six hours. It is the first sub-24 hour result ever on the "wild & tough" course in Silverton (CO).
Hardrock is considered by many the hardest 100 mile mountain trail run in the world (Barkley lacks trail). It boasts 10058 meters (33000 feet) total elevation gain. The lowest point is 2341 m (7680') and the highest point 4282 m (14048').
For comparison, here in Europe our premier race The North Face Ultra-Trail Tour du Mont Blanc (UTMB) offers a longer 166.4K (103.4 miles) course with a more modest 9400 m (30840') total elevation gain. The lowest point of UTMB is 807 m (2648') and the highest point 2537 m (8323').