Jordyn Wieber of the United States of America performs on the floor exercise in the Artistic Gymnastics Women's Team final on Day 4 of the London 2012 Olympic Games

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Nathan Adrian of the United States competes in the Men's 100m Freestyle semi final 2 on Day 4 of the London 2012 Olympic Games

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Shannon Taylor (2R) of the United States is congratulated by team-mates after scoring the first goal during the Women's Hockey Match between Argentina and the United States on day 4 of the London 2012 Olympic Games

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Gabrielle Douglas, Kyla Ross, Mc Kayla Maroney and Jordyn Wieber of the United States celebrate during the final rotation in the Artistic Gymnastics Women's Team final on Day 4 of the London 2012 Olympic Games

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Allison Schmitt (L) of the United States is congratulated by Bronte Barratt of Australia after winning gold in the Women's 200m Freestyle final on Day 4 of the London 2012 Olympic Games

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Allison Schmitt of the United States celebrates after winning gold in the Women's 200m Freestyle final on Day 4 of the London 2012 Olympic Games

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Michael Phelps of the United States leaves the pool after winning the silver in the Men's 200m Butterfly final on Day 4 of the London 2012 Olympic Games

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Alex Morgan of United States runs with the ball during the Women's Football first round Group G match between the United States and DPR Korea,on Day 4 of the London 2012 Olympic Games

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Michelle Vittese (down) of the United States is challenged by Josefina Sruoga of Argentina during the Women's Hockey Match between Argentina and the United States on day 4 of the London 2012 Olympic Games

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Stephanie Houghton (L) of Great Britain celebrates with her team-mates after scoring the opening goal during the Women's Football first round Group E Match between Great Britain and Brazil on Day 4 of the London 2012 Olympic Games

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Michael Phelps of the United States leaves the pool after winning the silver in the Men's 200m Butterfly final on Day 4 of the London 2012 Olympic Games

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Chad le Clos of South Africa celebrates after winning the gold in the Men's 200m Butterfly final on Day 4 of the London 2012 Olympic Games

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Silver medallist Michael Phelps (R) of the United States passes gold medallist Chad le Clos of South Africa as leaves the pool after competing the Men's 200m Butterfly final on Day 4 of the London 2012 Olympic Games

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Chad le Clos of South Africa touches to win the gold ahead of bronze medallist Takeshi Matsuda of Japan in the Men's 200m Butterfly final on Day 4 of the London 2012 Olympic Games

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Novak Djokovic (R) of Serbia shakes hands with Andy Roddick (L) of the United States after defeating him in the second round of Men's Singles Tennis on Day 4 of the London 2012 Olympic Games

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Maria Sharapova of Russia celebrates defeating Heather Watson of Great Britain in the second round of Women's Singles Tennis on Day 4 of the London 2012 Olympic Games

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Mc Kayla Maroney, Kyla Ross, Alexandra Raisman, Gabrielle Douglas and Jordyn Wieber of the United States celebrate after winning the gold medal in the Artistic Gymnastics Women's Team final on Day 4 of the London 2012 Olympic Games

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Debbie Phelps (R) the mother of Michael Phelps of the United States reads Sports Illustrated magazine prior to the evening session on Day 4 of the London 2012 Olympic Games

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The United States celebrate after winning the gold medal in the Artistic Gymnastics Women's Team final on Day 4 of the London 2012 Olympic Games

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Abby Wambach of USA battles with Choe Un Ju of DPR Korea during the Women's Football first round Group G match between the United States and DPR Korea,on Day 4 of the London 2012 Olympic Games

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Afonso Domingos and Frederico Melo of Portugal compete in the Men's Star Sailing on Day 4 of the London 2012 Olympic Games

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The United States celebrate after winning the gold medal in the Artistic Gymnastics Women's Team final on Day 4 of the London 2012 Olympic Games

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Gabrielle Douglas of the United States poses with the gold medal after helping the United States win the Artistic Gymnastics Women's Team final on Day 4 of the London 2012 Olympic Games

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