Sergio Mendoza Stuns Ricardo Sandoval, Takes Flyweight Belts

Sergio Mendoza Cordova scored a fifth-round stoppage of Ricardo Sandoval on Saturday night in Chicago, ripping away the unified WBA and WBC flyweight titles in a result almost nobody at Wintrust Arena saw coming.

Mendoza (28-1, 24 KOs) dropped Sandoval (27-3, 18 KOs) three times before the referee stepped in during the fifth round, ending the champion's first defense in brutal fashion. Sandoval actually had his moments early, flooring Mendoza with a right hook in round two, but the Mexican southpaw shook it off and started walking Sandoval down. From there, Sandoval never found an answer.

Why Was Sandoval Such a Heavy Favorite

Ricardo Sandoval came into the fight off a career-best win, a split decision over Kenshiro Teraji in Japan in July 2025 that made him a unified champion. That victory set up Saturday night as a chance to build momentum and chase bigger names at 112 pounds. Instead, Sandoval had not fought in more than fifteen months, and the rust showed almost immediately once Mendoza began letting his hands go. A title defense that was supposed to be a tune-up turned into the kind of firefight an inactive champion rarely wins.

What Mendoza's Win Means for the Flyweight Division

Sergio Mendoza's victory is the kind of result that reshuffles an entire weight class overnight. He arrived in Chicago on the back of a second-round knockout loss to Thanongsak Simsri this past April, when he stepped in as a late replacement and heavy underdog making his U.S. debut. Six months later he is a two-belt champion, and that turnaround says plenty about his power and his ability to absorb a knockdown and keep working. Sandoval, meanwhile, now has to climb back from the first real setback of his career, and the big crossover fights that were supposed to be waiting for him belong to somebody else.

Betting Angle

Sandoval opened as the clear favorite for this defense, and that line looks badly out of step with how the fight actually played out. Bettors leaning on Sandoval's recent win over Teraji were pricing in sharpness that fifteen months of inactivity simply did not allow for, while Mendoza's style, high volume, constant pressure, real pop in both hands, was always live-underdog territory against a champion returning from a long layoff. Expect Mendoza to open as a short favorite in any rematch clause or voluntary defense conversation, and expect Sandoval's market price in future fights to reflect real questions about his chin and his conditioning against come-forward punchers.

For now, Mendoza holds both belts, and Sandoval is left searching for answers after treating a tune-up fight like a formality.

Frequently Asked Questions

Who beat Ricardo Sandoval for the flyweight titles?

Sergio Mendoza Cordova stopped Ricardo Sandoval in the fifth round on Saturday night in Chicago to win the unified WBA and WBC flyweight titles.

How many times did Sergio Mendoza knock down Ricardo Sandoval?

Sergio Mendoza dropped Ricardo Sandoval three times before the referee stopped the fight in the fifth round at Wintrust Arena.

Had Ricardo Sandoval fought before this title defense?

Ricardo Sandoval had not fought in more than fifteen months before facing Sergio Mendoza, with his last bout being a split-decision win over Kenshiro Teraji in July 2025 that made him a unified flyweight champion.