Track and Field: Usian Bolt vs. Justin Gatlin

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Rivalries to Watch at the 2012 Olympics

After besting fellow American Tyson Gay in the U.S. time trials - Gatlin has one more runner on his list. The 30-year-old runner has his sights on Jamaica's Usain Bolt, who ran world-record times in the 100m and 200m in 2009. (Getty Photos: Daniel Sannum Lauten (AFP)/Christian Petersen)

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Men's Swimming: ... A power-shifting rivalry that began in the 2004 Games, Lochte and Phelps will be going head-to-head in up to six events in London. (Getty Images/Adam Pretty)
Track and Field:... Felix, U.S., and Brown, Jamaica, have been competing against one another in the 200m since 2004. Felix holds three world championships to Brown's two gold medals, but Felix has her eyes on the gold for London. The title of world's top sprinter is traded often between the two. (Thomas Lohnes/AFP/Getty Images)
Women’s Gymnasti... The 2008 Beijing Games had the U.S. and China fiercely competing against one another. After a poor performance at worlds, China will need to step up its game to challenge the favored Americans in the 2012 Games. (Getty Images/Jamie McDonald)
Men’s Gymnastics... The Chinese have been the dominant team for the past decade, and Japan is now stepping up to take their place. Kohei Uchimura, the world's best gymnast, leads the Japanese going into the 2012 London Games. (Getty Images: Richard Heathcote/Jamie McDonald)
Track and Field:... Although Gay was the last person to beat Usian Bolt, Gatlin has proven himself to be a new serious challenger. Both runners have come back from problematic years to make the Olympic team - Gay with injuries and Gatlin from alleged doping - and have yet to face one another in a major head-to-head competition. (Getty Images/Alex Livesey)
Track and Field:... After besting fellow American Tyson Gay in the U.S. time trials - Gatlin has one more runner on his list. The 30-year-old runner has his sights on Jamaica's Usain Bolt, who ran world-record times in the 100m and 200m in 2009. (Getty Photos: Daniel Sannum Lauten (AFP)/Christian Petersen)