Rousey rips Mayweather again, says she nets more 'per second' than him

Ronda Rousey is taking a few more hard long-distance shots at Floyd Mayweather.

A few weeks after defiantly saying she could take Mayweather in a no-holds-barred bout, the UFC champion boasted that she earns more per second than the pound-for-pound king of boxing.

"[Floyd] said, 'You make $300 million a night, then you can give me a call' ... and I actually did the math, and given the numbers of my last fight, I'm actually the highest-paid UFC fighter and I'm a woman," she said.

Rousey, approached Tuesday by a TMZ Sports photographer in Los Angeles, said that Mayweather can contact her to discuss her rebuttal to his recent boast about how big a payday he got this year once "he learns to read."

"I think I actually make two to three times more than he does per second ... so when he learns to read and write, he can text me," she said in the TMZ video while out walking her dog.

When pressed by TMZ on whether she makes more than Mayweather does, Rousey responded, "Yeah, I'm just more efficient."

Her verbal jab was an apparent rejoinder to a comment Mayweather made on ESPN's SportsCenter earlier this month on how much money he made this year.

"I've yet to see any MMA fighter, or other boxer, make over $300 million in 36 minutes," Mayweather said. "When she can do that, then call me."

Mayweather made about $102,000 per second for his May 3 fight against Manny Pacquiao, the biggest bout in boxing history. He fought 2,160 seconds and made at least $220 million.

If Rousey earned $102,000 per second for her 34-second fight against Bethe Correia, she would have had to have made $3.47 million. Earning two to three times more per second than Mayweather would mean she would have made between $6.9 million and $10.4 million for her Aug. 3 title fight.

The UFC did not disclose Rousey's earnings for the Correia fight because that bout took place in Brazil, which has no public record requirement of how much the fighters earned.

Rousey made a disclosed fight purse of $130,000 in a 14-second February win against Cat Zingano, and Forbes estimates she made $3 million from June 2014 to June 2015 from UFC salary.

Rousey has been sharply critical of Mayweather in the recent past, refusing to back down in her war of words in early August when she said she could beat boxing's biggest champion in a no-rules mixed martial arts-style fight in the Octagon.

Her challenge came almost a month after she told reporters after winning an ESPY award for Best Fighter, for which Mayweather was a nominee: "I wonder how Floyd feels being beat by a woman for once. I'd like to see him pretend to not know who I am now."

Rousey said she had been waiting for the right opportunity to call out Mayweather, who in a July 2014 interview said of her, "I don't even know who he is."

Rousey (12-0) is the only women's bantamweight champion in the UFC's history. A two-time U.S. Olympic judoka, she has dominated her new sport. She defended her title by knocking out Correia only 34 seconds into the first round at UFC 190 in early August.

Information from ESPN's Darren Rovell was used in this article.