Mechas used for Sports

What's your thoughts on the idea of mechas being used in sporting event(in fiction or otherwise)? I'm asking because I thought about making a story involving a mecha-based sporting event, but I can't seem to get any opinions on the idea.

I imagine this http://i205.photobucket.com/albums/bb220/MVHS_Dynasty/Misc/RockemsockemRobots.jpg But in reality, it'll end up with two robots hugging on the floor until one of them taps out

Watch the movie Real Steel. It's pretty much big-ass robots punching the shit out of each other. :) http://www.imdb.com/title/tt0433035/