It's amusing to see the underdog win, but it doesn't happen often. Normally I root for the kid who i think has the biggest heart, whether it be the tiniest kid on the team, or the largest.
For example, I wrestle for my HS.
This kid Caleb is 103 lbs. The smallest on the team, but he NEVER quits. He always gives it his all, even if he's a varsity 112 first year freshman and the kids are always bigger than him.
I'm 125 during season, and people also say that I don't quit. I'm the cocky, conceited bastard that you always see and will say "damn can't wait for him to lose" but no matter what, as long as you give it everything you've got, I can walk off that mat with a smile even if I lose