Ethiopia's Meseret Defar, second from left, paces herself before winning the gold medal in the 5000 meters at the 2012 London Olympics on Friday.

PHOTOGRAPH BY: Wally Skalij / Los Angeles Times

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USA's Morgan Uceny trips in the last lap in the 1500 meters at the 2012 London Olympics on Friday.

PHOTOGRAPH BY: Wally Skalij / Los Angeles Times

http://framework.latimes.com/?attachment_id=67759

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USA's Morgan Uceny falls to the track after tripping in the last lap in the 1500 meters at the 2012 London Olympics on Friday.

PHOTOGRAPH BY: Wally Skalij / Los Angeles Times

http://framework.latimes.com/?attachment_id=67760

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USA's Morgan Uceny weeps after tripping and falling to the track in the last lap in the 1500 meters at the 2012 London Olympics on Friday.

PHOTOGRAPH BY: Wally Skalij / Los Angeles Times

http://framework.latimes.com/?attachment_id=67761

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An emotional Morgan Uceny of the USA walks off the track after tripping in the last lap in the 1500 meters at the 2012 London Olympics on Friday. She did not finish the race.

PHOTOGRAPH BY: Wally Skalij / Los Angeles Times

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USA's Carmelita Jeter takes the baton from Bianca Knight on the last leg and wins the gold in the 4 X 100 relay in world record time at the 2012 London Olympics on Friday.

PHOTOGRAPH BY: Wally Skalij / Los Angeles Times

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USA's Keshia Baker collides with Brazil's Jailma De Lima during the 4 X 400 preliminary at the 2012 London Olympics on Friday.

PHOTOGRAPH BY: Wally Skalij / Los Angeles Times

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USA's Carmelita Jeter reacts upon winning the gold in the 4x100 relay in world record time at the 2012 London Olympics on Friday.

PHOTOGRAPH BY: Wally Skalij / Los Angeles Times

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From left, USA's Tianna Madison, Bianca Kinght, Carmelita Jeter and Allyson Felix celebrate after winning the 4x100 relay in world record time at the 2012 London Olympics on Friday.

PHOTOGRAPH BY: Wally Skalij / Los Angeles Times

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From left, USA's Tianna Madison, Carmelita Jeter, Bianca Knight and Allyson Felix stand by the scoreboard after winning the 4x100 relay in world record time at the 2012 London Olympics on Friday.

PHOTOGRAPH BY: Wally Skalij / Los Angeles Times

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From left, Bianca Knight, Allyson Felix, Tianna Madison and Carmelita Jeter celebrate after winning the 4x100 relay in world record time at the 2012 London Olympics on Friday.

PHOTOGRAPH BY: Wally Skalij / Los Angeles Times

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USA's Joshua Mance picks up the second leg of the 4x400 relay at the 2012 London Olympics on Friday. The U.S. picked up the silver, and the Bahamas won the gold.

PHOTOGRAPH BY: Wally Skalij / Los Angeles Times

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USA's Angelo Taylor crosses the finish line to pick up the silver medal as runners from the Bahamas celebrate the gold in the 4x400 relay at the 2012 London Olympics on Friday.

PHOTOGRAPH BY: Wally Skalij / Los Angeles Times

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Team USA guard Chris Paul hounds Argentina's Pablo Prigioni in a London 2012 Olympics men's basketball semifinal at North Greenwich Arena.

PHOTOGRAPH BY: Robert Gauthier / Los Angeles Times

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Tyson Chandler, left, and Kevin Durant of Team USA, harass Argentina guard Carlos Delfino in the second half of the London 2012 Olympics men's basketball semifinal at North Greenwich Arena.

PHOTOGRAPH BY: Robert Gauthier / Los Angeles Times

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Team USA forward Carmelo Anthony shows frustration as he is tied up with Argentina's Luis Scola in the second half of the London 2012 Olympics men's basketball semifinal at North Greenwich Arena.

PHOTOGRAPH BY: Robert Gauthier / Los Angeles Times

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Team USA's Kevin Love slams home two points over Argentina defender Manu Ginobili in the first half of the London 2012 Olympics men's basketball semifinal at North Greenwich Arena.

PHOTOGRAPH BY: Robert Gauthier / Los Angeles Times

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Team USA's LeBron James makes a dazzling pass to a teammate as Argentina's Pablo Prigioni looks on during the second half in the London 2012 Olympics men's basketball semifinal at North Greenwich Arena.

PHOTOGRAPH BY: Robert Gauthier / Los Angeles Times

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Team USA's LeBron James strikes a menacing pose after a slam dunk in the second half against Argentina in the London 2012 Olympics men's basketball semifinal at North Greenwich Arena.

PHOTOGRAPH BY: Robert Gauthier / Los Angeles Times

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Azerbaijan's Ashraf Aliyev finds himself in a tough situation against Japan's Sohsuke Takatani during quarterfinals in a wrestling match at the 2012 London Olympics on Friday.

PHOTOGRAPH BY: Wally Skalij / Los Angeles Times

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US wrestler Jordan Burroughs gets out of the grip of Iran's Sadegh Saeed during the men's 74kg freestyle wrestling gold medal match at the London 2012 Olympics Excel Arena.

PHOTOGRAPH BY: Robert Gauthier / Los Angeles Times

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U.S. wrestler Jordan Burroughs keeps the pressure on Iran's Sadegh Saeed during the men's 74kg freestyle wrestling gold medal match at the London 2012 Olympics Excel Arena.

PHOTOGRAPH BY: Robert Gauthier / Los Angeles Times

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U.S. wrestler Jordan Burroughs, left, reacts after defeating Iran's Sadegh Saeed, right, to win the men's 74kg wrestling gold medal match at the London 2012 Olympics Excel Arena.

PHOTOGRAPH BY: Robert Gauthier / Los Angeles Times

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U.S. wrestler Jordan Burroughs jogs around the mat, waving an American flag, after defeating Iran's Sadegh Saeed to win the men's 74kg wrestling gold medal at the London 2012 Olympics Excel Arena.

PHOTOGRAPH BY: Robert Gauthier / Los Angeles Times

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Britain's Crista Cullen unleashes a shot against New Zealand in the second half of the women's field hockey bronze medal match. Britain won, 3-1.

PHOTOGRAPH BY: Jae C. Hong / Associated Press

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Britain's Alex Danson, left, celebrates with teammates Laura Bartlett, Laura Unsworth and Chloe Rogers after scoring a goal during the host team's 3-1 win over New Zealand in the women's field hockey bronze medal match.

PHOTOGRAPH BY: Rolf Vennenbernd / EPA

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Alex Meyer of the United States, right, and Australia's Ky Hurst compete in the men's 10-kilometer swim at the 2012 Summer Olympics on Friday.

PHOTOGRAPH BY: Kirsty Wigglesworth / Associated Press

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The field clears a jump in the women's BMX cycling semifinals.

PHOTOGRAPH BY: Phil Walter / Getty Images

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Airborne against a blue sky, competitors race in the men's BMX cycling semifinals.

PHOTOGRAPH BY: Phil Walter / Getty Images

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The Netherlands' Lisa Westerhof and Lobke Berkhout compete in the women's 470 class sailing. The Dutch team took the bronze medal.

PHOTOGRAPH BY: Gerry Penny / EPA

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Germany's Ronald Rauhe paddles in a men's kayak single 200-meter heat.

PHOTOGRAPH BY: Natacha Pisarenko / Associated Press

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Joanna Mitrosz of Poland performs in the rhythmic gymnastics individual all-around competition.

PHOTOGRAPH BY: Ronald Martinez / Getty Images

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Bulgaria's Teodor Todorov, left, and Vladimir Nikolov try to block the ball during the men's volleyball semifinals against Russia. Russia prevailed, 3-1.

PHOTOGRAPH BY: Krill Kudryavtsev / AFP/Getty Images

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Spain's bronze-medal-winning synchronized swimming team heads to the pool for the free routine final.

PHOTOGRAPH BY: Barbara Walton / EPA

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Members of Japan's synchronized swimming team compete in the team free routine final.

PHOTOGRAPH BY: Fabrice Coffrini / AFP/ Getty Images

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Francisco Daniel Soler Tanco of the U.S., in red, and Matthew Judah Gentry of Canada compete in the men's freestyle wrestling 74-kilogram quarterfinals. Gentry won, 3-0, to advance.

PHOTOGRAPH BY: Richard Heathcote / Getty Images

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The British team competes in the women's synchronized swimming free routine final.

PHOTOGRAPH BY: Al Bello / Getty Images

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Australian sailor Malcolm Page gives himself a celebratory dunking after he and teammate Mathew Belcher won gold in men's 470 two-person dinghy racing.

PHOTOGRAPH BY: WILLIAM WEST / AFP

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Oussama Mellouli of Tunisia makes waves on his way to gold in the men's 10-kilometer swim.

PHOTOGRAPH BY: Charlie Riedel / Associated Press

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Jana Berezko-Marggrander of Germany performs with the ribbon in the rhythmic gymnastics individual all-around competition.

PHOTOGRAPH BY: Rob Carr / Getty Images

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Racers catch some air in a women's BMX semifinal run.

PHOTOGRAPH BY: Matt Rourke / Associated Press

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