Slick Boxers Who Are Tough.

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Hopkins
Calzaghe could be called slick.
Willie Pep
Ray Robinson
Ray Leonard
Shane Mosley(not really slick, but still tough)
Same goes with Oscar Dela Hoya
Wilfredo Benitez
Muhamad Ali

Agreed, on Ray Leonard, he was definitely tough. He had to be to go toe to toe with Duran for 15 rounds, giving Duran all he could handle.

Leonard could definitely take a good punch. He also had the ability to raise the level of his game when the going got tough, as in the first fight against Hearns, and also against Donny Lalonde, where leonard was hurt and came back strong to score a crushing knockout.