Fresh off his latest triumph, UFC champion Conor McGregor continues to call out boxing champion Floyd Mayweather and attempt to lure him into a bout.
McGregor called Mayweather "afraid" and demanded $US100 million ($A134 million) for a showdown between the two during an appearance in a New York nightclub on Tuesday.
"As far as real fighting - true, pure unarmed combat - Floyd don't want none of this," McGregor said.
"I want the $US100 million cash to fight him in boxing rules because he's afraid of a real fight."
Talk of a possible fight between the two biggest stars of their respective sports picked up steam in the spring with both stoking the idea.
But in more recent times, Mayweather has dismissed the notion.
The 39-year-old Mayweather retired in September of 2015 after accumulating a 49-0 record during a 19-year career that produced world titles in five weight divisions and earnings in excess of $US800 million ($A1.1 billion).
McGregor is flying high after last week's knockout win over Eddie Alvarez which made him the first duel champion in UFC history as he now holds both the featherweight and lightweight titles.
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