WATCH: Mayweather and McGregor trade barbs in build-up to big fight
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Floyd Mayweather and Conor McGregor traded verbal jabs as the circus-like countdown to their money-spinning superfight cranked into overdrive on the Las Vegas Strip.
Mayweather, the 40-year-old undefeated former welterweight boxing champion, has been lured out of retirement to face McGregor, a star of mixed martial arts' Ultimate Fighting Championship.
The two men meet in a 12-round contest under boxing rules on Saturday that is tipped to become the richest fight in history.
The cross-combat collision has appalled boxing purists, with many decrying the event as a farcical publicity stunt more in keeping with the choreographed traditions of WWE wrestling.
Mayweather and McGregor insist however that they are ready to deliver a battle for the ages.