Fighting words? Floyd Mayweather on Ronda Rousey: 'I don't know who he is'

Ronda Rousey joked that she could beat boxer Floyd Mayweather Jr. with some 'Bloodsport' moves in the ring. Too bad the world boxing welterweight champion has never heard of the UFC star.

Floyd Mayweather Jr. says he never heard of UFC women's bantamweight champion Ronda Rousey.

Harry How/Getty Images, Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images

In March, UFC star Ronda Rousey joked with an LA-based radio station that she could beat boxer Floyd Mayweather Jr. by staying low to the ground and doing some "monkey crawl" moves from "Bloodsport." 

A few months later, UFC president Dana White took that challenge a bit more seriously, declaring Rousey "wouldn't beat him. She'd hurt him badly" if Mayweather ever set foot inside an octagon. 

Too bad the multi-division boxing champion wouldn't be able to distinguish Rousey from Adam. 

"I don't know who he is," Mayweather said (at about the 36-second mark) during the following interview: 

When explained that Rousey is a female UFC star, the boxer threw up his hands in bewilderment: "I ain't know who that is." 

Are these fighting words? 

UPDATE 7/18/2014: Mayweather apologized to the UFC champ. "I wish her a congratulations because I didn't know who she was," the boxing champ told FightHub TV. "I apologize because I didn't know. You know, I'm used to watching football and basketball ... I'm not really into boxing like that."