The greatest round of boxing in history: Marvellous Marvin Hagler vs Thomas "Hitman" Hearns Round 1. They truly hated each other and they set out to prove it here with both men going for a 1st Round knockout. Hearns hit Hagler so hard with a left in this round that he broke his hand. Could any of today's boxers live with this kind of ferocity? Breathless stuff!