By Olu Allen
The 31-year-old superstar became the first boxer to unify all four recognized titles at 168 pounds and the first Mexican fighter to become an undisputed champion.
Alvarez (57-1-2, 39 KOs) scored a pair of knockdowns in Round 11 to stop Plant (21-1, 12 KOs) via TKO and make history inside the MGM Grand Garden Arena.
The victory got him, Alvarez, a standing ovation following the finish as referee Russell Mora waived off the fight following the second knockdown without a count even though Plant looked to still be conscious.
Alvarez outlanded Plant by a margin of 117 to 101, according to ShoStats. He held an advantage in body shots by a 53-13 margin and also connected on 41 percent of his power shots.
Plant showed his quick hands and responsible defense throughout to extend Alvarez into the championship rounds. But he was never able to consistently land anything of power beyond counter jabs due to Alvarez’s own exceptional guard.
Alvarez adjusted to Plant’s speed as early as the opening round by routinely cornering him and pounding away to the body. Although Plant made some adjustments entering the second half of the fight just as Alvarez slowed down a bit, he was unable to land anything of significance to dissuade Alvarez from coming forward.
Plant suffered the first defeat of his career to end an IBF title reign that began by defeating Jose Uzcategui in 2019.
The results of the undercard are as follows:
Anthony Dirrell def. Marcos Hernandez via fourth-round knockout.
Rey Vargas def. Leonardo Baez via unanimous decision (99-91, 100-90, 100-90).
Elvis Rodriguez def. Juan Pablo Romero via fifth-round TKO