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Tyson Furys reign as world heavyweight champion could be nearing a sad end following recent revelations about his cocaine use, and a second failed drug test.Fury has not been able to defend his titles since taking them off Wladimir Klitschko last November, and risks losing his licence, as his private life has spiralled in the aftermath of what should have been the greatest night of his life.The British boxer clearly has personal problems that he must come to terms with and address, but does he have a future in the ring? ESPN looks at five previous champions, and their battles, to find an answer.Sugar Ray LeonardConsidered one of the greatest fighters ever to step inside a ring, Leonard has admitted battling with a cocaine addiction during the 1980s. Having originally called time on his career in 1982, following an eye injury, the five-weight world champion turned to the drug to combat anxiety.Leonard would fight just once in the next five years -- a knockout of Kevin Howard in 1984 -- as his addiction took hold. However, he was able to beat his demons and following a split decision win over Marvin Hagler, would remain in the sport for another decade, winning titles at middleweight and super middleweight.Leon SpinksSpinks made history when he beat Muhammad Ali on Feb. 15, 1978. In just his eighth professional fight, the then-24-year-old had become world champion -- no one had ever done it quicker. His success should have signalled the start of a long and illustrious career.Unfortunately for Spinks, the demons that would derail his career were already bubbling close to the surface. Just two months after his defeat of Ali, the American boxer was arrested in possession of cocaine and marijuana. He would fight until the age of 42, but he was never able to fulfil the promise of that first world title fight, losing the rematch to Ali before being knocked out by Larry Holmes in 1981.Sirimongkol SingwangchaThai boxer Singwangcha won world titles at bantamweight and super featherweight in the 1990s and 2000s, before being arrested in possession of drugs in his homeland in 2009. He was sentenced to 20 years in prison, but served only four due to his status as one of his countrys biggest boxing talents.Singwangcha continued to fight following his release and remains active, having gone more than 10 years without defeat.Oliver McCallMcCall stunned Lennox Lewis to win the WBC heavyweight title at Wembley Arena in 1994, a crown he would lose to Frank Bruno next door at Wembley Stadium 12 months later. The Americans battle with addiction became painfully obvious to those watching in Las Vegas in 1997 as he began to weep as he lost his rematch with Lewis.His career was marked by a number of run-ins with police and stints in rehab, culminating in two arrests in 2010 for drug possession. McCall was declared alcohol and drug-free for 2011, and continued fighting until 2014.Ricky HattonHatton came to prominence with a stunning victory over Kostya Tszyu in 2005. The Mancunian followed that up with wins over Luis Collazo and Jose Luis Castillo.However, his diet outside of the ring had long been a cause for concern and heavy defeats to Floyd Mayweather Jr. and Manny Pacquiao pushed him towards retirement. Just over a year after his loss to Pacquiao a newspaper sting alleged Hatton was a regular cocaine user. Hatton made one final, losing appearance in a boxing ring before concentrating on his promoting work. Cheap Air Max 98 . Walcott is available for Saturdays home match against Southampton as Arsenal looks to extend its two-point lead at the top of the Premier League. The Gunners are currently the second highest scorers in the league but Wenger insists Walcott will add something extra to his team. Air Max 98 For Sale . Now, correct me if Im wrong but I saw one official distinctly pointing at the net indicating a good goal but after an inconclusive review they overturned the goal. Shouldnt the ruling on the ice (good goal) stand after an inconclusive review? Why was this overturned? James Veaudry Pembroke, ON -- Hey Kerry, Youll get a lot of these, but why was the Montreal goal against Nashville Saturday night overturned? Eller puts the puck on net and the on ice ruling from the ref behind the net is a Montreal goal. http://www.wholesaleairmax98.com/ . With Parker having a quiet game for once, Nicolas Batum and Boris Diaw provided the scoring as France won its first major basketball title by beating Lithuania 80-66 on Sunday. It was a victory that ended a decade of frustration for Parker and a talented French generation, which lost the final against Spain two years ago and took bronze in 2005. Air Max 98 Buy Online . -- Quarterback Will Finch threw for 252 yards and three touchdowns, and Yannick Harou rushed in two scores as the No. Air Max 98 Wholesale . Terms of the deal were not immediately available. The 26-year-old finished last season with Clevelands Triple-A affiliate in Columbus after signing with the Indians in August. Villanova remained on top of The Associated Press college basketball poll on Monday while Southern Cal made its first appearance this season and Florida State returned to the rankings.The Wildcats (10-0) received 56 first-place votes from the 65-member national media panel to stay No. 1 for a second straight week.The top 11 teams remained the same from last week, with UCLA (10-0) second with three first-place votes.Florida dropped out from 21st after losing to Duke and Florida State. Iowa State, which was 25th, lost to Iowa last week and also dropped out of the rankings. The Cyclones had been ranked for 61 consecutive polls, the third-longest active streak behind Kansas (148) and Arizona (84).Kansas was third followed by Baylor (8-0), which got the other six first-place votes, Duke, Kentucky, North Carolina, Gonzaga, Indiana, Creighton and Louisville.West Virginia moved up three places to 12th and was followed by Virginia, Wissconsin, Purdue, South Carolina, Xavier, Butler, Arizona and Saint Marys, which dropped eight spots to 20th after losing to Texas-Arlington.ddddddddddddThe last five ranked teams were Notre Dame, Oregon, Florida State, Southern Cal and Cincinnati.Florida State was tied for No. 25 in the Week 3 poll after a 4-0 start, then fell out the next week after a Thanksgiving Day loss to Temple. The Seminoles returned to this weeks poll after beating then-No. 21 Florida on Sunday.Southern Cal was ranked for two weeks last season.There are three double-ranked games on Saturday. Kentucky and North Carolina play in Las Vegas while a doubleheader in Indianapolis features Indiana against Butler and Purdue facing Notre Dame.---More AP college basketball: www.collegebasketball.ap.org and https://twitter.com/AP-Top25 ' ' '