At 45-0 with 26 knockouts, Floyd Mayweather is approaching the 46-0 career mark of retired Welsh star Joe Calzaghe and the iconic 49-0 mark of heavyweight legend Rocky Marciano. Photo: AFP At 45-0 with 26 knockouts, Floyd Mayweather is approaching the 46-0 career mark of retired Welsh star Joe Calzaghe and the iconic 49-0 mark of heavyweight legend Rocky Marciano. Photo: AFP
At 45-0 with 26 knockouts, Floyd Mayweather is approaching the 46-0 career mark of retired Welsh star Joe Calzaghe and the iconic 49-0 mark of heavyweight legend Rocky Marciano. Photo: AFP

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At 45-0 with 26 knockouts, Floyd Mayweather is approaching the 46-0 career mark of retired Welsh star Joe Calzaghe and the iconic 49-0 mark of heavyweight legend Rocky Marciano. Photo: AFP At 45-0 with 26 knockouts, Floyd Mayweather is approaching the 46-0 career mark of retired Welsh star Joe Calzaghe and the iconic 49-0 mark of heavyweight legend Rocky Marciano. Photo: AFP
At 45-0 with 26 knockouts, Floyd Mayweather is approaching the 46-0 career mark of retired Welsh star Joe Calzaghe and the iconic 49-0 mark of heavyweight legend Rocky Marciano. Photo: AFP
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