Mendoza turned pro in 2014 and currently trains with legendary Cuban boxing trainer Ismael Salas.
After compiling a record of 20–2, he knocked former world titleholder Jeison Rosario on just 10 days notice.
[1] Mendoza followed up this upset victory with a stunning 7th round KO over previously undefeated Sebastian Fundora to win the WBC Interim Light Middleweight World Title.
In his next match he lost to WBO junior middleweight champ Tim Tszyu, being stripped of his own title in the process.
In 2024, he took a fight at short notice against Serhii Bohachuk 23-1(23) for the vacant WBC interim junior middleweight championship, which was his old title.