heretic@hops.cs.jhu.edu,Internet writes:

Olympic Space Battle:  The shortest gold metal match in history pits
the SDF-1 versus the Yamato.  Once the main gun and wave-motion cannon
have both been fired, the winner is determined by counting the metric
tons of debris remaining.  Winner: the SDF-1 by 6 kg!

   A bit off-topic, but another one could be: 
Olympic Planet Battle:  Unicron vs. the Death Star

Women's sorcery - Gold medal match pits Urd vs...  Actually, I'm kinda
stumped here.  Any help?

   Linna Inverse from The Slayers.  Definite competition!

Men's freestyle martial arts, superhuman class - Son Gokou versus
Kagato.  After last year's "boo-boo", the gold medal match has been
moved to an uninhabited island in the Pacific.

   Island?  Why not try unhinabited planet or even Solar System 
if things get messy...  You forgot Vegeta, Freezer and Cooler in the Z Team.

Women's unlimited combat, tag team - Team Tenchi, Ryoko, Aeka, and
Mihoshi, take on the Priestess of Mount Muldoon.  Expect the Tenchi
girls to win, due partly to Mihoshi's ridiculous luck, but also because
Ryoko will fight dirty.

   Not so sure about that... Do you remember how Shayla-Shayla retaliated 
when she found out Makoto was a guy?  Can you say nuclear strike (well,
almost...)

Another Phoenix