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. Cheap Adidas Penguins Jerseys . Louis Blues. Shane Hnidy joins Brian Munz for the broadcast on TSN 1290 Radio at 7pm ct. Cheap Adidas NHL Jerseys . Catch all the action on TSN2 at 11pm et/8pm pt. The nine-time Big 12 champion Jayhawks are positioning themselves for another title, as they have run out to a flawless 6-0 mark in conference play thus far. http://www.adidaspenguinsjerseys.com/ . LOUIS -- The New Orleans Saints looked like a team playing out the string. Wholesale Penguins Jerseys .C. at the helm of the top team in the Eastern Conference. 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HOUSTON -- Houstons Brock Osweiler has been so bad on the road this season that a fan started a Go Fund Me page in a comical attempt to raise money to buy out his $72 million contract.Criticism of Osweiler and his huge deal have increased with each Houston loss, and his latest lackluster performance in Mondays defeat at Denver spawned countless memes mocking the quarterback.The good news for Osweiler and the Texans is that they return to Houston this week where theyll look to improve to 5-0 at home when they host the Detroit Lions .Osweiler hasnt been great in Houstons four home wins, but he has been much better than on the road, with seven of his eight touchdown passes coming in those victories.Osweiler has struggled to get Houstons passing game going and the Texans rank 30th in the league with 204.3 yards passing a game despite having big-play receivers DeAndre Hopkins and rookie Will Fuller.Osweiler knows he needs to play better and eliminate mistakes, but also noted that a win on Sunday would leave the team in a pretty good spot at the midway point of the season.If we can put ourselves 5-3, 2-0 in the division, first place in the division going into the bye week, everything else is irrelevant, he said.Though Osweiler has taken much of the blame for Houstons offensive struggles this season, Hopkins was quick to point out that everyone on the offense needs to improve to turn things around.Anytime we lose a game, you cant point the fingers at the guy that everybody wants to point the finger at because its not just him, Hopkins said. Theres 10 other guys on the field that need to help him out, including myself.Theyll try to get back on track against a Detroit team that has won three in a row behind the late-game heroics of quarterback Matthew Stafford to improve to 4-3. Stafford is fourth in the NFL with 15 touchdowns and has thrown just four interceptions.Stafford deflected credit for the fourth-quarter comebacks to his teammates.More than anything, it says a lot about the guys around me and the team I have, he said. Ive been really privileged to play with a lot of really good players. In those situations, you just try to put the ball in position for those guys to go make plays, and Ive had guys around me that have made plays.Some thinggs to know about the Detroit-Houston game.ddddddddddddMILLERS HEALTH: Houston running back Lamar Miller has been limited in practice this week after taking a shot to his shoulder in the first quarter against Denver, but he is expected to play on Sunday. He has been one of the few bright spots on the offense this season and is fifth in the NFL with 581 yards rushing.SLAY LIKELY OUT: Detroits top cornerback Darius Slay will likely miss Sundays game because of a hamstring injury. Slay sat out the second half last week with the injury and hasnt practiced this week.If he cant go, it will put more pressure on cornerback Nevin Lawson to make plays. Lions coach Jim Caldwell said Lawson is playing a lot better than he did last season.Hes been steadily growing and last week he had a really, really good game, Caldwell said. Played extremely hard, played extremely well, so I like where hes trending.RUN DEFENSE WOES: Houston is looking to improve its run defense after allowing 190 yards rushing to Denver on Monday.While Houstons pass defense is among the best in the league, the Texans have had trouble against the run all season and rank 29th by allowing 135.4 yards rushing a game.We all have to do a better job, coach Bill OBrien said. Weve got to coach it better. Weve got to get off blocks better. Weve got to tackle better. At times, we stop it and it looks pretty good, but its too inconsistent. We have to do a much better job.HEALTHY CLOWNEY: Texans defensive end Jadeveon Clowney continues to play well in his first healthy season after missing significant time in his first two injury-plagued years in the NFL. Clowney has moved to defensive end after playing outside linebacker his first two seasons to fill in for J.J. Watt, who is out for the season with a back injury.The top overall pick in the 2014 draft has started each game and has 27 tackles and two sacks, and his eight tackles for losses are the most by an NFL defensive end this season. 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