Some Professional Boxers 

 - Muhammad Ali (January 17, 1942 – June 3, 2016): nicknamed by "The Greatest", and he is ranked s the greatest heavyweight boxer. he played 61fight, Ali won 56 fights with 37 KO wins  and lost 5 fights. 

-  Mike Tyson: at the age of 20 Tyson became the youngest heavyweight boxing champ in history. Tyson won his first 19 professional fights by knockout, 12 of them in the first round. Claiming his first belt at 20 years. He played in total 58 fights, he won 50 of them.