JJ Gregorowicz was one of the best trials competition riders the US ever had. Maybe the best. He carried an effortless style that made even his mistakes seem graceful. He also rode at a time when trials bikes still mostly looked like bikes and wheels often made full rotations. the sport is something different today but I'd rather watch JJ roll things than most of today's top riders hop their way through a career.
Here's a video from him screwing around at the 2001 Vail Worlds.
jj uci from cesar barba on Vimeo.