Julio Cesar Chavez Sr Reveals Surprising Opponent Who Packed Hardest Punch: "It Hurt" Julio Cesar Chavez Sr, one of boxing's all-time greats, has picked Edwin Rosario as the hardest puncher he faced in his long career. Chavez shared this insight during a chat with The Ring Magazine, looking back on his 25 years in the ring.

Julio Cesar Chavez Sr Reveals Surprising Opponent Who Packed Hardest Punch: "It Hurt"

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