Heavyweight contender Alexander Povetkin failed his second drug test in seven months, forcing his vacant interim world title fight against former world titleholder Bermane Stiverne to be canceled about 20 hours before they were to walk to the ring.Povetkin and Stiverne were due to meet on Saturday at the Ekaterinburg Expo Center in Ekaterinburg, Russia, Povetkins home country.However, the fight was canceled when the WBC withdrew its sanction of the bout because Povetkin tested positive for the banned substance ostarine in a random Voluntary Anti-Doping Association drug test conducted under the WBCs Clean Boxing Program, which allows for random testing at any time.Povetkin provided the sample on Dec. 6 and VADA notified the fighters and organization of the failed test on Saturday.The WBC hereby withdraws its sanctioning of the bout for the heavyweight interim world championship and will conduct a thorough investigation of the circumstances of the case and will issue subsequent rulings as required, the WBC wrote in its ruling.Ostarine, which is supposed to increase stamina and recovery ability, has been on the World Anti-Doping Agency banned list since 2008.Povetkin promoter Andrey Ryabinsky of World of Boxing said of the positive test on social media that Povetkin was not clear where it came from.Stiverne (25-2-1, 21 KOs) could have gone through with the bout but without the sanction and a chance to win the interim title he elected not to.Theres no reason to fight if the WBC wont sanction the bout, Stiverne said. Im very disappointed in the actions of Povetkin. Ive been training for months to be victorious. To wake up the day of the fight, have breakfast, take a nap and wake up to find out he tested positive is the worst possible situation.World of Boxing announced that Johann Duhaupas (34-3, 21 KOs), 35, of France, would step in and face Povetkin in the new main event. Duhaupas has won two fights in a row, including a six-round knockout of Robert Helenius on April 2, since WBC titleholder Deontay Wilder knocked him out in the 11th round of a title defense September 2015.Apparently, Duhaupas was already in Russia and took the fight on less than a days notice, although it is unclear how the fight was set up so quickly and why Russian regulators are allowing Povetkin to fight in the wake of the failed test.Stiverne, 38, who was born in Haiti and lives in Las Vegas, made immediate plans to leave Russia.Im headed back home to Las Vegas, he said. Hopefully, the WBC will install me as the mandatory challenger to face Deontay Wilder. I want the opportunity to fight for the world title again, that was my whole reason to come to Russia was to earn that opportunity.Stiverne, who is promoted by Don King, lost a lopsided decision and the title to Wilder in January 2015 in Las Vegas. However, with Wilder sidelined after having surgery this past summer because of a hand and biceps injury, the WBC sanctioned the interim title bout.The cancelation of the fight will cost both fighters their purses of $1,424,250 apiece. Another $316,500 would have gone to the winner of the fight, which Ryabinsky won at a purse bid.It is Povetkins second canceled fight because he tested positive for a banned substance this year. He was the mandatory challenger and due face Wilder on May 21 in Moscow. The fight was canceled nine days beforehand, when Povetkin (30-1, 22 KOs), 37, failed a VADA test for the banned substance meldonium, which he claimed he ingested before the drug was added to the WADA banned list in January.The WBC ultimately elected to not punish Povetkin because the amount of the substance in his system was far below the threshold accepted by WADA in an updated notice on the drug published in June. There remain questions, however, about how Povetkin could have tested negative in random VADA doping tests conducted April 7, 8 and 11 while his April 27 sample -- the A and the B -- was positive for meldonium.Povetkins latest failed test came a month after Stiverne failed a random drug test for the banned substance methylhexaneamine, a stimulant also known as dimethyamylamine or DMAA. The WBC fined Stiverne $75,000 but ruled that he would still be allowed to fight. The WBC said Stiverne was cooperative and 100 percent forthcoming during its investigation.Stiverne informed the WBC that on the day of the test, in order to facilitate urination, he took a dietary supplement called Superharm in front of the sample collector, the WBC said at the time. He reported the ingestion of that supplement in the declaration of medication use section of the doping control form he filled in connection with the test. Bruno Caboclo Jersey . Numbers Game examines the deal that sees Michael Del Zotto and Kevin Klein switch places. The Predators Get: D Michael Del Zotto. Cheap Swingman Kings Jerseys . -- Anaheim Ducks defenceman Luca Sbisa will be out at least six weeks with a torn tendon in his right hand. http://www.cheapsacramentokingsjerseys.com/ . 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BEREA, Ohio -- Cleveland Browns running back Isaiah Crowell said Wednesday he will donate about $35,000 to a fallen officers fund in Dallas as part of his apology for posting a drawing on Instagram last week showing a police officer getting his throat slashed.Crowell, in a video posted on Facebook, apologized again for the post and said he would donate his first game check to a fund for the police officers slain and injured during a sniper attack last week. He didnt say what the exact amount would be, but his yearly salary is $600,000 covering 17 weeks of the NFL season, including a bye.I know this might not change your mind about me, and I know I cant take the post back, but Im sorry and moving forward Im committed to being part of the solution, the 23-year-old Crowell said in the video.Crowell posted the drawing after black men in Louisiana and Minnesota were fatally shot by police. He subsequently deleted the post, but a screenshot continued to be circulated on social media.Crowell said he was frustrated and upset and let his emotions get the better of him. He said he knew the post was wrong almost immediately and deleted it with no prompting.I would never wish violence on anyonee, especially a police officer, he said.ddddddddddddStill, the post upset Cleveland police officers who are preparing for the Republican National Convention starting next week in the city. Steve Loomis, the president of the Cleveland police union, had threatened to pull police staffing of Browns games because of it, but he said Wednesday he was satisfied with Crowells apology and donation.Five police officers were killed in the Dallas attack last Thursday night at a protest over the shooting deaths of the two black men by white officers. Seven other officers and two civilians were wounded.The Browns were clear about their displeasure with Crowells post, calling it an extremely disturbing and unacceptable social media decision in a statement released earlier this week. The team called on Crowell to take steps to make a positive difference after a very negative and impactful post.Crowell had 706 yards rushing and four touchdowns for Cleveland last year. The former Alabama State star has totaled 1,313 yards rushing and 12 TDs in two seasons with the Browns. ' ' '