There are two fights: One between Iron Glory and Kuratas at around 7:18, and the other much more interesting one between Eagle Prime and Kuratas at 12:52.
From Megabots:
BEHOLD, THE WORLD’S FIRST GIANT ROBOT DUEL, BETWEEN MEGABOTS, INC (USA) AND SUIDOBASHI HEAVY INDUSTRY (JAPAN)! Science fiction fantasies become reality as gigantic robots, piloted by their creators, go head-to-head in this historic battle!
The first fight, between the robots Iron Glory and Kuratas, begins at about seven minutes in. The second one, between Eagle Prime and Kuratas, begins at 13 minutes.