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          Jaime Munguia tested positive for banned substance after win

          • Andreas Hale, ESPNMay 30, 2025, 03:33 AM
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              Andreas Hale is a combat sports reporter at ESPN. Andreas covers MMA, boxing and pro wrestling. In Andreas' free time, he plays video games, obsesses over music and is a White Sox and 49ers fan. He is also a host for Sirius XM's Fight Nation. Before joining ESPN, Andreas was a senior writer at DAZN and Sporting News. He started his career as a music journalist for outlets including HipHopDX, The Grammys and Jay-Z's Life+Times. He is also an NAACP Image Award-nominated filmmaker as a producer for the animated short film "Bridges" in 2024.
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          Former junior middleweight titleholder Jaime Munguia's win over Bruno Surace on May 4 could be in jeopardy after he tested positive for a banned substance following a postfight urinalysis.

          A representative from Munguia's team told "ESPN KnockOut" commentator Salvador Rodriguez on Thursday that they received a notification from the Voluntary Anti-Doping Association on Wednesday night regarding exogenous testosterone metabolites in Test A and that they will officially respond. The representative from Munguía's team said they will soon request that Test B be opened.

          Munguia (45-2, 35 KOs) has 10 days to request analysis of Test B for exogenous origin of testosterone metabolites. If his B sample also returns an adverse finding for the banned substance, the former champion could see his victory by decision overturned to a no contest and face a suspension ranging from six months to one year.

          In a statement on social media, Munguia said he was tested twice during his training camp and both came back negative, which is why the VADA notification "has been a complete surprise to me." He added that he's willing to undergo any "retroactive, current, or future testing to demonstrate that I have always been a clean athlete."

          Munguia's promoter, Golden Boy Promotions, has not responded to ESPN's request for comment.

          Munguia avenged a stunning sixth-round knockout loss to Surace in December with a wide decision win in the rematch earlier this month on the Riyadh Season card that was headlined by Canelo Alvarez's win over William Scull.