I never understood the idea behind the "lucky punch". If you try to smash your fist into a guy's chin, and you DO smash your first into a guy's chin, how is that lucky? You accomplished the EXACT goal you were trying to.

A lucky punch would be if Marquez slipped on a wet patch in the canvas, and while flailing his arms, his glove hit Pacquaio and knocked him out. That's luck.