Where does this come from, and can I check it?

He beat Conor McGregor in 2017 to pass Rocky Marciano's 49-0. The figure is taken from International Boxing Hall of Fame, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a sports fact?

Yes. It sits on the Sports shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

Floyd Mayweather retired with a 50-0 record

He beat Conor McGregor in 2017 to pass Rocky Marciano's 49-0 Mayweather won world titles in five weight divisions from super featherweight to light middleweight. His last fight was a stoppage of the mixed martial arts fighter Conor McGregor in Las Vegas in August 2017. Rocky Marciano had retired unbeaten at 49-0 in 1956. It sits in Mondo's sports collection, one of 200 facts that each trace back to the reference below.

Where this comes from

International Boxing Hall of Fame

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

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Sports trivia

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Tags: boxing, record, las-vegas

Floyd Mayweather retired with a 50-0 record: the short answers

Where does this come from, and can I check it?: He beat Conor McGregor in 2017 to pass Rocky Marciano's 49-0. The figure is taken from International Boxing Hall of Fame, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a sports fact?: Yes. It sits on the Sports shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.