7:00 PM PDT, July 27, 2012
During the 1988 Seoul Olympics, U.S. swimmer Greg Louganis suffered a concussion after hitting his head on the springboard during preliminary rounds while performing a reverse 2 1/2 pike. He completed the preliminaries despite the injury and earned the highest single score of the qualifying for his next dive. He later went on to repeat the dive during the finals and took the gold medal by a whopping margin of 25 points.
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Greg Louganis
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During the 1988 Seoul Olympics, U.S. swimmer Greg Louganis suffered a concussion after hitting his head on the springboard during preliminary rounds while performing a reverse 2 1/2 pike. He completed the preliminaries despite the injury and earned the highest single score of the qualifying for his next dive. He later went on to repeat the dive during the finals and took the gold medal by a whopping margin of 25 points.
Carl Lewis
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During the 1984 Games in Los Angeles, U.S. athlete Carl Lewis won four gold medals in the 100m, 200m, long jump and 4x100m relay. He later took the gold at four consecutive Olympic competitions.
Michael Phelps
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Domination is the only word that really fits to describe U.S. swimmer Michael Phelps' Olympic appearances. He's won 16 Olympic medals total -- six gold and two bronze in Athens in 2004, and eight gold in Beijing in 2008, easily taking the most medals by any athlete at both Olympic Games.
Florence Griffith-Joyner
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Nicknamed Flo Jo, Florence Griffith-Joyner set two world records in the 200 meters at the 1988 Games in Seoul. She set records in her semifinal heat as well as the finals and sailed on to medal gold.
Mary Lou Retton
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After suffering an unlikely knee injury while signing autographs just after the U.S. Olympic Trials in 1984, U.S. athlete Mary Lou Retton bounced back to become the first female gymnast to win the Olympic all-around title from outside Eastern Europe. She also won two silver medals and two bronze that same year.
Nadia Comaneci
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Nadia Comaneci stunned the sports world at the 1976 Games in Montreal by becoming the first Olympian to receive a perfect score of 10 in her routine on the uneven bars.
Muhammad Ali
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Muhammad Ali was known as Cassius Clay when he won a gold medal at the 1960 Rome Olympics in the Light Heavyweight boxing division. He made an emotional return to the 1996 Atlanta Games where he lit the torch during the opening ceremony despite suffering from severe Parkinson's disease.
US Hockey Team 1980
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In one of the most dramatic underdog victories in sports history, the U.S. Men's Hockey team stunned the much-favored Soviet Union team on February 22nd, 1980, beating them 4-3. Days later they also beat Finland to capture the gold medal.
Tanya Harding
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During the 1994 Winter Olympics in Lillehammer, Tanya almost failed to appear on the ice when her name was called for the free skating because she was scrambling to replace a broken skate lace. The replacement turned out to be too short to fully lace up the skate, and after missing the opening jump in her program, she again had to ask the referee for permission to find a new lace.
US Women's Soccer Team
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During the 2004 Athens Games, the U.S. Women's Soccer Team captured the goal during a match that went into overtime and featured a last-minute, game-winning goal. Abby Wambach scored the winning point against Brazil, which earned the team their second gold medal in eight years.
Top 10 Emotional Olympic Moments
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Many of the most intense moments in sports history have occurred during the Olympic Games -- both triumphs and heartache. After the official kickoff of the London 2012 Summer Olympics, we decided to assemble some of the most memorable and emotional moments in the history of the prestigious competition.