American boxing champion Rocky Marciano, who retired as undefeated World Heavyweight champion, shows new British professional Pat Dwyer how to lead, at the Cambridge gym, in London, in 1965 Stock Photo - Alamy
Nate Diaz will give Jake Paul a 'tougher fight than people realize,' says retired undefeated boxer
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On This Day - Apr 27 1956: Rocky Marciano retires as undefeated heavyweight boxing champion of the world – The Irish News
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The 9 greatest undefeated boxers in history ...
Seven boxers who retired as world champions amid rumours Anthony Joshua could quit even if he wins Ruiz Jr rematch – The Sun | The Sun
March 1, 1949: Joe Louis... - Daily Black History Facts | Facebook
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Ask Steven: How many British boxing world champions have retired undefeated? | ESPN Blogs | ESPN.co.uk
Rocky Marciano The only world heavyweight boxing champion to retire undefeated, his 49 victories featured 43 knockouts… | Boxing champions, Boxer, Sporting legends
Rocky Marciano was a balding, late starter to boxing with a small reach. What allowed him to become the only heavyweight champion to retire undefeated in boxing history, was his conditioning and
Terence Crawford Says His Goal Is Not To Retire Undefeated, But To “Fight The Best Fights Out There” - Boxing News
Who is the greatest boxer without losing and didn't run from any fight? - Quora
