Floyd Mayweather Jr. refused on Wednesday to back off earlier comments declaring himself a better fighter than Muhammad Ali.

Mayweather said he respects Ali's great career and the things he did outside the ring. But he said he believes he has done as much in boxing as the legendary former heavyweight champion ever did, without the losses that Ali suffered in his career.

"He called himself The Greatest and I call myself TBE (The Best Ever)," Mayweather said. "I'm pretty sure I'll get criticized for what I said, but I could care less. I could care less about the backlash."