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[Flop]

Well, all the advice so far has been good, but if you really, really want to win a fight, the best advice is to hit the other guy as hard as you can on the nose. If you hit him right and hard enough, he'll go down in one punch. This is why so many fights are over before they start: someone hits someone else on the nose, before that guy even realises that a fight has started. Of course, doing that means that you yourself have to start the fight, which is never recommended (if you ask me, at least).

If the fight has already started (and you somehow avoided getting knocked out), my best advice is to keep trying to avoid getting hit on the nose, and go for the other guy's balls. Then stomp on his neck when he's down.

Edit: I think it should be noted that stomping on the guys neck when he's down, carries a risk of killing him. But hey, you wanted to fight, right?