Californians Ryan Carlson and Bobby Martinez have spearheaded an American assault on world surfing’s richest single-manoeuvre prize purse.

Aerial master Carlson and the resurgent World Championship Tour surfer Martinez have led the US raid on the US$50,000 Kustom Air Strike event, which overnight drew 10 new high quality entries from around the world.

Carlson launched into a must-be-seen-to-be-believed Kerrupt flip, while Martinez lays down a wildly smooth forehand aerial reverse.

You can check out the entries at Kustom Air Strike