'Robot Combat League'
If you haven't seen it, I suggest a look at SyFy channel's 'Robot Combat League'. It's clearly quite heavily 'stage-managed' but it looks spectacular - like a real-life go at the fights of Real Steel.
The robots are huge upright, hydraulically-actuated walking frames (though cheekily stabilised - possibly even moved around - by a massive strut from behind). One operator moves the robot, the other wears a pair of 'Waldo'* arms that replicate movements onto the robot and they just punch each other to pieces.
*Check your Heinlein