Defending light heavyweight titleholder Adonis Superman Stevenson and challenger Thomas Top Dog Williams Jr. staged a brief but scintillating slugfest from the opening round and didnt let up until the fourth, when Stevenson knocked out Williams to retain his title Friday night in the headliner of a Premier Boxing Champions card at the Videotron Centre in Quebec City, Canada.Stevensons (28-1, 23 KOs) knockout came at 2:54 of the fourth round, and he made his seventh successful title defense.He wanted to put on some pressure, so I put some on as well, said Stevenson, who fought for the first time since scoring a third-round knockout of club fighter Tommy Karpency in September in Toronto. Two men who know how to fight. We gave a good show, and thats what people want to see.The fight nearly ended in the first, when Stevenson connected with a hard left to the side of Williams head that floored him with approximately 30 seconds left in the round. Williams (20-2, 14 KOs) gamely beat referee Michael Griffins count and survived until the bell.Williams, from Fort Washington, Maryland, displayed courage by going toe-to-toe with one of boxings hardest punchers. He staged a spirited rally in the second round, working his way inside by ducking low and catching Stevenson with flush punches. The champion was rocked back on his heels several times, drawing gasps from the crowd.It still looked like anybodys fight in the third, when the two continued to trade vicious punches. Stevenson drilled Williams with a head-snapping uppercut, only to have Williams roar back with hard blows of his own.Stevenson, 10 years Williams senior at age 38, launched a concentrated body attack in the fourth, but one of his punches landed below the belt, forcing the referee to call a timeout while Williams recovered.Undaunted by a potential penalty if he hit low again, Stevenson continued to sink blows into Williams body. Then, with the weakened challenger almost doubled over, Stevenson landed a final crushing left to the head that put Williams on the canvas again and ended the fight.It was a firefight, Stevenson said. It was a fight with two guys who could punch and it was spectacular. It was my daughters birthday and I gave her a great gift.In the chief supporting bout, undefeated Eleider Alvarez won a unanimous 10-round decision over Robert Berridge in a humdrum cruiserweight bout.Alvarez (20-0, 10 KOs), a Colombian fighting out of Montreal, battered New Zealands Berridge (27-5-1, 21 KOs), who suffered a swollen right eye and bloody mouth, but stayed on his feet throughout the bout.I am happy with the win, but I would have liked a knockout, Alvarez said. He was tough, but he did not hurt me at all and I thought that I hurt him. I am ready for my next challenge, which will hopefully be a world title fight.The Associated Press contributed to this report. 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MOSCOW -- Russia named 68 athletes on Tuesday it wants to send to the Olympics in Rio de Janeiro if its global ban from track and field is lifted.The list approved by the suspended All-Russia Athletic Federation appears to contradict an earlier promise not to send any athletes who have previously been banned for doping offenses.Former world indoor champion triple jumper Yekaterina Koneva made the list even though she served a ban from 2007 to 2009. Other notable athletes with past doping offenses have been left out.ARAF promised in May not to select former dopers as it tried to persuade the IAAF to lift its suspension. That attempt failed last month when the IAAF upheld the ban.Any potential participant in the Olympics who has been found to have taken banned substances in previous years cannot be a member of the Russian national Olympic team in Rio, the federation said at the time.ARAF said all 68 met Olympic qualifying standards and registered as plaintiffs in the Russian Olympic Committees suit at the Court of Arbitration for Sport aiming to lift the ban on the Russia team. They also have been confirmed by the ARAF main coaching council and presidium, the federation said.CAS is due to hear the claim on July 19 and rule by July 21.Russia was suspended by the IAAF in November after a World Anti-Doping Agency reeport detailed widespread doping allegedly supported by the Russian state.ddddddddddddThe list of 68 includes numerous potential medal contenders in Rio such as two-time Olympic pole vault champion Yelena Isinbayeva, world 110-meter hurdles champion Sergey Shubenkov and Olympic high jump gold medalist Ivan Ukhov.Olympic high jump gold medalist Anna Chicherova was cut from the Rio team after she was provisionally suspended by the IAAF for failing a retest of her sample from the 2008 Olympics, the Russian Olympic Committee has said.In a sign of the damage wrought by Russias doping scandals, the list contains a severely weakened team of race walkers and no 800-meter runners. Russia won gold and bronze in the womens 800 in London, but both Russian medalists from that final were suspended after undercover footage appeared to show them confessing to doping.Numerous other Russian medalists from the 2012 Games have been implicated in doping scandals. Two walkers were stripped of gold and silver medals by a CAS ruling this year, while 3,000 steeplechase champion Yulia Zaripova is set to lose her gold medal after being banned. Discus thrower Darya Pishchalnikova lost her silver medal in 2013. ' ' '