Boxer Claressa Shields, shown here in November 2015, wants to follow in Muhammad Ali's footsteps. Harry How/Getty Images hide caption

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For Olympic Boxer Claressa Shields, Round 2 Brings New Expectations

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New analysis of stored samples taken from athletes at the Beijing and London Summer Olympics has turned up 45 cases of banned substances. Here, urine samples are recorded upon arriving at the China Anti-Doping Agency in Beijing in 2008. Robert F. Bukaty/AP hide caption

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Referee Torsten Berg tried to get players from Indonesia (near court) and South Korea to try their hardest during this match at the London Olympics. The format gave some teams an incentive to lose — in order to get easier opponents in upcoming matches. That format's being changed. Adek Berry /AFP/Getty Images hide caption

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A team of torchbearers brings the Paralympic flame through Piccadilly Circus as the torch heads across London to the Olympic Stadium. The Paralympic Games' opening ceremony will be held Wednesday at 3:30 p.m. ET. LOCOG/Getty Images hide caption

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Olympic Bodies: They Just Don't Make Them Like They Used To

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Germany's Laura Ludwing wears Kinesio tape during a women's beach volleyball match on July 31, 2012, during the London 2012 Olympic Games. Daniel Garcia/AFP/Getty Images hide caption

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Endurance athletes like Michael Phelps, here at the 2012 U.S. Olympic Swimming Team Trials in Omaha, can easily burn off stacks of pancakes. Jamie Squire/Getty Images hide caption

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