LAS VEGAS: Mixed martial arts star Conor McGregor vowed to knock out boxer Floyd Mayweather on Friday as a horde of Irish fans descended on Las Vegas for the trash-talking rivals' cross-combat super-fight.

McGregor, 29, will carry a substantial weight advantage into Saturday's 12-round boxing contest at the T-Mobile Arena after a raucous weigh-in that saw him face-off with Mayweather for the final time before fight-night.

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