Heavyweight champion Deontay Wilders title defense against Alexander Povetkin has been postponed by the WBC after the Russian challenger failed a drug test.
The WBC says the 21 May fight in Moscow is off, pending an investigation, with no back-up date.
Keeping the priority of safety and also the principle of justice, the WBC will continue the investigation into the case, the WBC said in a statement. Consequently, the event scheduled for 21 May in Moscow is hereby officially postponed.
It added that the WBC will be releasing more information in the coming days regarding the final ruling on the matter.
Povetkins promoter has said the substance found in an April test was meldonium, the stamina booster for which tennis star Maria Sharapova and dozens of other athletes in ex-Soviet nations have tested positive since it was banned at the start of this year.
Wilder, an unbeaten American (36-0), had been due to make his fourth defense of the belt he won against Bermane Stiverne in January last year. For Povetkin (30-1), it is his first world title challenge since dropping a unanimous decision to Wladimir Klitschko in 2013.
Wilder had made allegations against Povetkin in an interview last year with USA Today. Wilder said he believed the Russian to be on some kind of steroids but said he was still willing to fight him.
Povetkins promoter Andrei Ryabinsky told Russias Tass news agency on Friday that his fighter had tested positive in April, but that only leftover traces of meldonium at a very low concentration were found. These traces, Ryabinsky said, were the result of Povetkin taking meldonium in September last year before it was banned.
Athletes in several sports have avoided suspensions for meldonium positive tests under new World Anti-Doping Agency guidance issued in April if the concentration of the heart drug is low enough to indicate they did not take it after 1 January.
It is not clear whether such guidance will apply in the case of Povetkin. The WBC works with the Las Vegas-based Voluntary Anti-Doping Association, which often follows Wadas example but is not under its supervision.
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