Pac's chin was one of boxings best. Not any more. Marquez cracked it. Once it's been cracked ain't nothing putting it back together to what it once was. John Mugabi had a hell of a chin. Had never been hurt before. Took Hagler 11 rounds to crack it. Eventually he did. And there was no putting it back. Next 2 name opponents Mugabi faces he doesn't make it out the first round