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. Garrett Bradbury Womens Jersey . Down by seven with 90 seconds left in regulation, thats where they looked comfortable. Dalvin Cook Vikings Jersey . Giroud, who wasnt in the starting lineup for two matches after allegations about his private life and a decline in form, scored twice in the first half. 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ARLINGTON, Texas -- The momentum quickly turned for 10th-ranked Texas A&M when Trevor Knight, the quarterback already with two long touchdown runs, had another big play right after a huge defensive stand by the Aggies.Knight hit Josh Reynolds for a 92-yard tiebreaking TD pass two plays after 17th-ranked Arkansas was stopped three times from the 1, ending a 19-play drive that took nearly 10 minutes, and the Aggies went on to a 45-24 victory late Saturday night.A big-time momentum-changer, Knight said.Reynolds caught the ball in stride just short of midfield and quickly shed defensive back DJ Dean on his way to the end zone to break a 17-all tie and put the Aggies (4-0, 2-0 Southeastern Conference) ahead to stay.Texas A&M has won five straight against the Razorbacks (3-1, 0-1), all since joining the SEC in 2012.This game has been something else, Aggies coach Kevin Sumlin said. I was proud of our guys. They hung in there, and it just really showed the maturity of our team tonight.The long catch-and-run by Reynolds came two plays after Keon Hatcher was tackled by Armani Watts for a 5-yard loss on fourth down, ending the drive that started after A&M fumbled from the Arkansas 2.Everybody talks about fourth-down stops, but it took three others to create a fourth-down stop, you know, from closer than that, Sumlin said. So it wasnt just the fourth-down stop. It was the three before it.Quarterback Austin Allen was stopped twice from the 1, though officials reviewed the third-down run before ruling the play stood. One overhead replay showed just how close the ball was to the goal line, with Allens tight end basically pulling him toward the end zone.Ive got to believe that the right call was made, Arkansas coach Bret Bielema said. It took forever. When those reviews take that long, usually its because theyre going to get overturned. Obviously a huge, huge play.Earlier, the Razorbacks had to settle for a field goal after six snaps from the 2 on the same series.Knights 48-yard TD run just before halftime tied the game at 17, after an earlier 42-yard scoring run. He finished with 10 rushes for 159 yards, the last a 62-yarder on third down in the final minute of the game.Were trying to grow with Trevor. I think tonight he struggled early throwing, but he got running, and that was it, Sumlin said. Sommebody asked me what his best stat is, and I said its winning.ddddddddddddTHE TAKEAWAYArkansas: The Razorbacks just squandered too many good chances. Along with that long drive in the third quarter that got them nothing, and the field goal after all the snaps from the 2, Rawleigh Williams fumbled just short of the end zone in the first half when it looked like the Razorbacks were about to go ahead by 10. That was one of three lost fumbles.Texas A&M: At 4-0 for the third straight season, a first since 1939-41, the Aggies finished strong against Arkansas for an emphatic victory after needing overtime to beat Arkansas the last two years. While it remains to be seen if they can truly challenge No. 1 Alabama for the SEC West title, Knight looks comfortable. He also threw for 225 and two scores.AILING AGGIETexas A&M receiver Rickey-Seals Jones suffered an apparent left ankle injury before halftime and was in a walking boot after the game. Sumlin wouldnt comment on his status.TOUGH ALLENAllen stumbled off the field clearly in pain after taking a hard shot on a third-down incompletion midway through the second quarter. The backup quarterback was warming up while Allen was getting tended to for what was called a bruised chest, but the junior quarterback showed his toughness and didnt missed a snap. He completed 28 of 42 passes for 371 yards and two touchdowns.Hes OK. Sore. Hell be real sore tomorrow, Bielema said. Hes a tough guy obviously. I think our guys know that. I appreciate that about him.POLL IMPLICATIONSArkansas: Since there are a pair of two-loss teams below them in the poll, and the Razorbacks at times outplayed a top-10 team, they certainly are good enough to still be ranked, though they likely will drop at least a couple of spots.Texas A&M: The Aggies will stay in the top 10, though there is little room for upward movement because of all the higher-ranked winners.UP NEXTArkansas: Razorbacks head home for their final nonconference game next Saturday against FCS team Alcorn State.Texas A&M: Aggies play away from Kyle Field for the third consecutive week when they go to South Carolina next Saturday.---AP college football website: www.collegefootball.ap.org ' ' '