Team U.S.A. toppled Japan at the first-ever giant fighting robot showdown.

American robotics company MegaBots and its Japanese rival, Suidobashi Heavy Industries, fought for technological superiority in a battle that was streamed online Tuesday evening.

In the first round, Suidobashi's Kurata robot effortlessly knocked out an older MegaBots robot with a single punch, giving the Japanese team a decisive edge.

But the main fight, between the Kurata and MegaBots' new multi-million dollar, massive Eagle Prime, ended in favor of the Americans.

Eagle Prime, bigger and heavier than the Kurata, produced a chainsaw that systematically took out the Japanese robot until the match was ended and the winner announced.

The MegaBots team expressed hope for a formal fighting robot league in the future after the match.