Late last year, Seb Bouin made the first ascent of a direct start to Chris Sharma's Jumbo Love (9b) at Clark Mountain, Nevada. He suggested a grade of 9b+, making it the most difficult sport route in America.

After his ascent, Seb said: 'This route and this place have been in my mind since I started I climbing. Finishing this trip by sending the direct start couldn't be more perfect'.

The route is seventy metres long and adds in 20m of hard climbing before the crux of Jumbo Love which equates to around 9a. After the crux, there's the matter of the extremely droppable slab...