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Oscar Pistorius Relay - 4-400 relay runner -The double-amputee runner from South Africa was on the track but didn't get to run in the 4x400-meter relay at the London Olympics because a teammate tumbled out in the first heat Thursday morning before reaching Pistorius for the changeover.

Missy Franklin of the United States turns in a women's 200-meter backstroke swimming heat at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Thursday, Aug. 2, 2012. (David J. Phillip / Associated Press) / AL

United States' Michael Phelps silver medal and Singapore's Joseph Schooling Gold medal check their times after a men's 100-meter butterfly heat during the swimming competitions at the 2016 Summer Olympics, Thursday, Aug. 11, 2016, in Rio de Janeiro, Brazil.

China's Peimeng Zhang, left, United States' Jarrion Lawson, center, and Canada's Mobolade Ajomale compete in a men's 4x100-meter relay heat during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, Thursday, Aug. 18, 2016. (AP Photo/Martin Meissner)

Canada's Dominique Bouchard competes during a women's 200-meter backstroke heat in the swimming competitions at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Thursday, Aug. 11, 2016. (AP Photo/Lee Jin-man)

Nigeria's 200m champion Divine Oduduru finished 2nd behind Usain Bolt in the Mens 200m Heat race at the Olympics today August 16th. Odurudu finished in a record time of 20.34 while Usain Bolt finished at 20.28. Usain Bolt Justin Gatlin Yohan Blake and Divine have advanced to the 200m semi-finals.The race in the ninth heat is the fastest time for a Nigerian athlete in history. The semi-finals take place at 02:00 BST on Thursday.

Canada's Damian Warner wins a men's decathlon 110-meter hurdles heat during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, Thursday, Aug. 18, 2016. (AP Photo/David J. Phillip)

Canada's Damian Warner and United States' Ashton Eaton, right, compete in a men's decathlon 110-meter hurdles heat during the athletics competitions of the 2016 Summer Olympics at the Olympic stadium in Rio de Janeiro, Brazil, Thursday, Aug. 18, 2016. (AP Photo/Martin Meissner)

United States' Missy Franklin competes in a women's 200-meter backstroke swimming heat at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Thursday, Aug. 2, 2012.

Canadian Penny Oleksiak and Simone Manuel of the United States were inseparable at the finish and even more united in joy after a stunning 100 metres freestyle dead-heat rewarded both with Olympic gold on Thursday.