In his later years as a pro, Sean Mannion was trained by Muhammad Ali’s guru, Angelo Dundee. According to Dundee, Mannion had the toughest chin he’d ever seen. n 57 fights, encompassing 439 rounds, he was never put on the floor.In his later years as a pro, Sean Mannion was trained by Muhammad Ali’s guru, Angelo Dundee. According to Dundee, Mannion had the toughest chin he’d ever seen. n 57 fights, encompassing 439 rounds, he was never put on the floor. …Read More

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