TRACK AND FIELD PHOTOS
BEIJING, CHINA - MAY 21: The night scene of National Stadium, also known as Bird's Nest, is seen during 2013 IAAF World Challenge Beijing on May 21, 2013 in Beijing, China. Beijing won the bid to host the 2015 IAAF World Championships in Athletics in 2010, and accordingly it will organize the world challenge games in 2013 and 2014 respectively. (Photo by Feng Li/Getty Images)
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BEIJING, CHINA - MAY 21: Kellie Wells of United States celebrates after she won the Women's 100 Metres Hurdles at National Stadium, also known as Bird's Nest, during 2013 IAAF World Challenge Beijing on May 21, 2013 in Beijing, China. Beijing won the bid to host the 2015 IAAF World Championships in Athletics in 2010, and accordingly it will organize the world challenge games in 2013 and 2014 respectively. (Photo by Feng Li/Getty Images)
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BEIJING, CHINA - MAY 21: Kellie Wells (Center) and Virginia Crawford (Right) of United States complete in the Women's 100 Metres Hurdles at National Stadium, also known as Bird's Nest, during 2013 IAAF World Challenge Beijing on May 21, 2013 in Beijing, China. Beijing won the bid to host the 2015 IAAF World Championships in Athletics in 2010, and accordingly it will organize the world challenge games in 2013 and 2014 respectively. (Photo by Feng Li/Getty Images)
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BEIJING, CHINA - MAY 21: Kellie Wells (Left) and Virginia Crawford (Right) of United States complete in the Women's 100 Metres Hurdles at National Stadium, also known as Bird's Nest, during 2013 IAAF World Challenge Beijing on May 21, 2013 in Beijing, China. Beijing won the bid to host the 2015 IAAF World Championships in Athletics in 2010, and accordingly it will organize the world challenge games in 2013 and 2014 respectively. (Photo by Feng Li/Getty Images)
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BEIJING, CHINA - MAY 21: Kellie Wells of United States completes in the Women's 100 Metres Hurdles at National Stadium, also known as Bird's Nest, during 2013 IAAF World Challenge Beijing on May 21, 2013 in Beijing, China. Beijing won the bid to host the 2015 IAAF World Championships in Athletics in 2010, and accordingly it will organize the world challenge games in 2013 and 2014 respectively. (Photo by Feng Li/Getty Images)
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BEIJING, CHINA - MAY 21: Kellie Wells of United States completes in the Women's 100 Metres Hurdles at National Stadium, also known as Bird's Nest, during 2013 IAAF World Challenge Beijing on May 21, 2013 in Beijing, China. Beijing won the bid to host the 2015 IAAF World Championships in Athletics in 2010, and accordingly it will organize the world challenge games in 2013 and 2014 respectively. (Photo by Feng Li/Getty Images)
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BEIJING, CHINA - MAY 21: LaShawn Merritt of United States celebrates after he won the Men's 200 Metres at National Stadium, also known as Bird's Nest, during 2013 IAAF World Challenge Beijing on May 21, 2013 in Beijing, China. Beijing won the bid to host the 2015 IAAF World Championships in Athletics in 2010, and accordingly it will organize the world challenge games in 2013 and 2014 respectively. (Photo by Feng Li/Getty Images)
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BEIJING, CHINA - MAY 21: LaShawn Merritt (L) and Keith Ricks (R) of United States complete in Men's 200 Metres at National Stadium, also known as Bird's Nest, during 2013 IAAF World Challenge Beijing on May 21, 2013 in Beijing, China. Beijing won the bid to host the 2015 IAAF World Championships in Athletics in 2010, and accordingly it will organize the world challenge games in 2013 and 2014 respectively. (Photo by Feng Li/Getty Images)
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BEIJING, CHINA - MAY 21: LaShawn Merritt (L) and Keith Ricks (R) of United States complete in Men's 200 Metres at National Stadium, also known as Bird's Nest, during 2013 IAAF World Challenge Beijing on May 21, 2013 in Beijing, China. Beijing won the bid to host the 2015 IAAF World Championships in Athletics in 2010, and accordingly it will organize the world challenge games in 2013 and 2014 respectively. (Photo by Feng Li/Getty Images)
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BEIJING, CHINA - MAY 21: Jason Richardson (L) and David Oliver (R) of United States complete in Men's 110 Metres Hurdles at National Stadium, also known as Bird's Nest, during 2013 IAAF World Challenge Beijing on May 21, 2013 in Beijing, China. Beijing won the bid to host the 2015 IAAF World Championships in Athletics in 2010, and accordingly it will organize the world challenge games in 2013 and 2014 respectively. (Photo by Feng Li/Getty Images)
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