Floyd Mayweather Jr. won a unanimous decision as he challenged for the 154-pound title owned by his opponent Miguel Cotto.

Mayweather, undefeated in 43 fights, added the World Boxing Association super welterweight belt to his list of accomplishments after the 12-round bout. Cotto, who drew blood when he connected with Mayweather’s nose, fell to 37-3 at the MGM Grand arena in Las Vegas.

“You’re a hell of a champion,” Mayweather told Cotto after the fight. “You’re the toughest guy I ever fought.”

Mayweather was guaranteed a record $32 million for the fight, while Cotto earned $8 million. Each fighter got a share of the pay-per-view receipts.

Mayweather landed 179 of 687 punches compared with 105 of 506 by Cotto.

“He’s a tough competitor,” Mayweather said. “He came to fight, he didn’t just come to survive. I dug down and fought him back.”

To contact the reporter on this story: Nancy Kercheval in Washington at nkercheval@bloomberg.net

To contact the editor responsible for this story: Michael Sillup at msillup@bloomberg.net