The closest thing to what you're describing was a 2013 SciFi series called http://www.syfy.com/robotcombatleague.
They were hydraulically powered humanoid robots that beat on each other until either one of them stopped functioning or it went to the judges' decision.
I just watched some highlights and man, is that lame. The robots have legs, and the legs move like they're walking, but the robots are actually just stuck on the end of big metal poles that move them around the ring.
I understand that technology isn't to the point where a bipedal robot can balance itself while executing complex movements, let alone while something else is trying to knock it down. But what they have there is stupid enough that they just shouldn't have bothered.