Darth Maul kills himself as soon has he reads his first match is against Jar Jar. :-P
But seriously:
Darth Maul jumps at Jar Jar. He lands in front of him and chops his ears off, rendering him deaf.
He jumps around extremetly fast so that Jar Jar can't see him, then sneaks up on him and slaps him with the ears 23 times across the eyes. Jar Jar is now blind.
Darth Maul shoves his fist down Jar Jar's throat and pulls his vocal chords out, making it impossible for him to be annoying.
Darth Maul cuts off Jar Jar's face, leaving only the back of his skull and half his brain.
Darth Maul pulls Jar Jar's skin off and slaps him with the ears again, this time on his entire body. The pain is unbearable.
Jar Jar finally collapses, but still has a small amount of life. Darth Maul acts quickly to give Jar Jar just a little more pain before he dies.
Darth Maul cuts all his limbs off and starts shoving them down Jar Jar's throat, but they don't all fit, so he makes a hole in Jar Jar's back so they can fall out and Darth Maul can stick the limbs back in him repeatedly. His internal organs are damaged greatly.
Finally Jar Jar dies. Darth Maul is extremely sad that he couldn't torture Jar Jar even more, and kills himself.
Draw, however Jar Jar died first so Darth Maul wins.
I also wish he could have been tortured more, but one can only live so long without their skin, limbs and face.
...
I'm so evil.