TMZSports.com

Keith Thurman Says He'd 'Kick Conor McGregor's Ass' Boxing Or MMA

Conor McGregor just got called the HELL out, and not by a scrub either ... The guy doing the talking is 28-0 welterweight champ Keith "One Time" Thurman, who says he'd destroy Conor on any shaped mat -- that includes octagons.

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