Marquez uses the uppercut very effectively now because guys like Diaz and Kastidis lean so far forward. Just like in Holyfield/Moorer II, when Moorer leaned forward with his gloves around his face when they were in close. When inside, turn your shoulder. And when you throw an uppercut, turn that punch so the index and middle knuckles land.
James Toney had an excellant uppercut.