I'll tell them he was good...lighting quick, but we never found out how good, which is sad and not necessarily his fault (though that is debatable as I believe stepping up and winning against Dawson would have made us all bow down).
Then I'd talk about how life tends to repeat itself, and point them to Rocky Marciano.
I will remember Pac, Marquez brothers, Morales, Barrera, Cotto, Margarito, P. Williams. Mayweather, Adamek, Mosley, Dela Hoya, Trinida, Toney, G. Johnson, Tarver, R. Jones, BHOP, Penalosa, Donaire, Pavlik, Lacy, Hatton, Judah, Baldomir, Cunningham, Mormeck, B erto, Holt, Bradley, Juan and David Diaz(no relations), Linares, JuanMa Lopez, and Kilitschko brothers. But in 20 years, i would not remember Joe C. so i got nothing to tell my children about him.
I will tell them that Joe Calzaghe was the best MW-LHW of his generation and beat the only 2 guys that can claim to be in his league. I will also tell them that Joe Calzaghe is only the 2nd (the 1st was Rocky Marciano) undefeated Champion in the Hall of Fame!
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