WBC junior welterweight champion **Subriel Matias** is facing a major setback ahead of his scheduled title defense against **Dalton Smith** after testing positive for the banned substance **ostarine** in a Voluntary Anti-Doping Association (VADA) sample[1][2][3]. The adverse finding, confirmed by multiple sources, has placed Matias under investigation by the New York State Athletic Commission (NYSAC), with the fight—set for January 10 at Barclays Center in Brooklyn—now in jeopardy[1][2].
Matias, a 33-year-old Puerto Rican with a record of 23-2 (22 KOs), has ten days to request the testing of his 'B' sample, which sources indicate he will pursue[1][2]. The NYSAC will review the levels of ostarine detected and determine whether Matias remains eligible to compete. Ostarine, classified as an anabolic agent and banned by the World Anti-Doping Agency since 2008, is known to promote muscle growth, enhance fat loss, and improve stamina and recovery—making it a frequent target in anti-doping enforcement[2].
The situation echoes recent high-profile cases, including Ryan Garcia's suspension for ostarine after his bout with Devin Haney in April 2024, also at Barclays Center. Garcia received a one-year suspension and had his victory overturned to a no-contest[1][2]. Other notable boxers, such as Lucian Bute and Amir Khan, have faced similar sanctions for ostarine use, resulting in disqualifications and lengthy bans[2].
If Matias
Matias, a 33-year-old Puerto Rican with a record of 23-2 (22 KOs), has ten days to request the testing of his 'B' sample, which sources indicate he will pursue[1][2]. The NYSAC will review the levels of ostarine detected and determine whether Matias remains eligible to compete. Ostarine, classified as an anabolic agent and banned by the World Anti-Doping Agency since 2008, is known to promote muscle growth, enhance fat loss, and improve stamina and recovery—making it a frequent target in anti-doping enforcement[2].
The situation echoes recent high-profile cases, including Ryan Garcia's suspension for ostarine after his bout with Devin Haney in April 2024, also at Barclays Center. Garcia received a one-year suspension and had his victory overturned to a no-contest[1][2]. Other notable boxers, such as Lucian Bute and Amir Khan, have faced similar sanctions for ostarine use, resulting in disqualifications and lengthy bans[2].
If Matias
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is ruled ineligible or stripped of his title, the WBC is expected to order a vacant title fight between Dalton Smith and former champion **Alberto Puello**[2]. Puello himself lost his WBA 140lbs title after testing positive for clomiphene, another banned substance, though his suspension was shorter due to mitigating circumstances[1]. The winner of Matias-Smith was already mandated to face Puello next, highlighting the division's turbulent recent history with doping violations.
Matias claimed the WBC belt in July 2025 with a majority decision over Puello, rebounding from a surprising loss to Liam Paro in June 2024. He previously held the IBF 140lbs title for over two years, known for his aggressive style and high knockout rate[1][2]. Smith, undefeated at 18-0 (13 KOs), is making his U.S. debut and entering his first world title fight. He was considered a slight underdog in what analysts called a virtual coin-flip matchup[2].
Professional observers note that Matias's positive test could dramatically alter the junior welterweight landscape. Ostarine's presence in boxing has prompted stricter oversight, and the NYSAC's decision will set a precedent for future cases. For now, the event remains on course pending further investigation, but the outcome will have significant implications for all parties involved, including the fighters, promoters, and the integrity of the sport[1][2][3].
Matias claimed the WBC belt in July 2025 with a majority decision over Puello, rebounding from a surprising loss to Liam Paro in June 2024. He previously held the IBF 140lbs title for over two years, known for his aggressive style and high knockout rate[1][2]. Smith, undefeated at 18-0 (13 KOs), is making his U.S. debut and entering his first world title fight. He was considered a slight underdog in what analysts called a virtual coin-flip matchup[2].
Professional observers note that Matias's positive test could dramatically alter the junior welterweight landscape. Ostarine's presence in boxing has prompted stricter oversight, and the NYSAC's decision will set a precedent for future cases. For now, the event remains on course pending further investigation, but the outcome will have significant implications for all parties involved, including the fighters, promoters, and the integrity of the sport[1][2][3].
