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Boxing - Floyd Mayweather Jr. vs Conor McGregor - Las Vegas, USA - August 26, 2017 Floyd Mayweather Jr. celebrates with the belt and President of the WBC Mauricio Sulaiman after winning the fight REUTERS/Steve Marcus TPX IMAGES OF THE DAY

Mayweather Retires With Perfect 50-0 Record: 'Tonight Was My Last Fight'

After defeating UFC champ Conor McGregor during their much-hyped Saturday night fight in Las Vegas, undefeated boxer Floyd Mayweather Jr. said he was hanging up his gloves — "for sure" this time...