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Cricket Web: All-Time Legend
ESPN dissecting him as we post (e.g. Teddy Atlas and Bernard Hopkins don't rank him in the top 20)I think Mayweather is quite entitled to claim he's the best ever. He's without question the best defensive technician ever, has a perfect record across a long career, and has beaten every challenger convincingly.
Plenty of people can argue the point but he's definitely up there.
Guy is a great fighter but has hand-picked his opponents for his entire career