Conor McGregor has courted racism controversy again with a social media post comparing Floyd Mayweather and Japanese kickboxing sensation Tenshin Nasukawa to Chris Tucker and Jackie Chan. Mayweather shocked the fighting world on Monday by announcing that he will take on Nasukawa, a 20-year-old undefeated kickboxing and karate specialist, in a fight with as yet unconfirmed rules in the Japanese city of Saitama on New Year’s Eve. McGregor, who had been talked about as an option for Mayweather’s comeback fight, mocked the American’s choice of opponent in a foul-mouthed Instagram post – but in doing so he compared the 41-year-old boxing great to comedian Tucker and Nasukawa to legendary Hong Kong martial artist and actor Chan, in a reference to the pair’s collaboration in the ‘Rush Hour’ film franchise.