"I was just about to start winning!"

Antonio "Margo" Margarito is a journeyman boxer from Mexico, most noted for having posed as a world-class fighter for several years by loading his gloves with plaster. After having been exposed as a cheater immediately prior to his fight with Shane Mosley, Margo went on to win exactly zero important fights, and in fact has received horrible assbeatings from every good fighter he's faced.