Canelo Álvarez stopped Caleb Plant in the 11th round to unify boxing’s super middleweight belts. Kamaru Usman beat Colby Covington to defend his U.F.C. welterweight championship. Rose Namajunas kept her U.F.C. strawweight title.
Alvarez, a 31-year-old from Guadalajara, Mexico, who is known as Canelo, landed a series of heavy blows — an uppercut, a left hook and several right hands — and Plant crumbled. He went down once, rose to resume fighting, and then went down again under heavy fire. The second time, he stayed down as the referee Russell Mora waved the fight off, and the sellout crowd of 16,586 spectators erupted in celebration.
Álvarez entered Saturday with titles from three major sanctioning bodies — the World Boxing Association, the World Boxing Council and the World Boxing Organization. With the win, he picked up the International Boxing Federation title and became the 168-pound division’s undisputed champion, a rare distinction in modern boxing. Pro boxing has 17 weight classes, but the only undisputed champions are Álvarez and Josh Taylor, who holds four titles at 140 pounds.
“To become the first Mexican unified champion means a lot to me,” said Álvarez, who is now 57-1-2. “That makes me happy. It motivates me.”
With the loss, Plant drops to 21-1. He first won the I.B.F. title in January 2019 with an upset victory over José Uzcátegui of Venezuela