In Kubwa: Mike Tyson knocks Floyd Mayweather for claiming to be greatest boxer of all time

Mike Tyson, knocks boxing champion Floyd Mayweather, for claiming he is the greatest boxer of all time because he retired undefeated at 50-0.

Tyson who retired with a record of 50-6, feels the icons of the sport have been disrespected by Mayweather's claim, even though Mayweather retired with a perfect record of 50-0, surpassing that of former heavyweight champion Rocky Marciano who quit the sport at 49-0.