12th IAAF World Challenge Athletics held in Beijing

Kellie Wells (2nd R) of the United States competes during women’s 100m hurdles at the IAAF World Challenge Athletics in Beijing, capital of China, May 21, 2013. Wells won the gold medal with 12.87 seconds.

Aries Merritt (R) of the United States competes during men’s 200m at the IAAF World Challenge Athletics in Beijing, capital of China, May 21, 2013. Merritt won the gold medal with 20.40 seconds. <Xinhua/Li Ming>

United States’ Justin Gatlin, right, and Michael Rodgers, left, after their competition in men’s 100 meter race during the IAAF World Challenge competition held in China’s National Stadium, also known as the Bird’s Nest, in Beijing, Tuesday, May 21, 2013. Gatlin won the event with 9.91 seconds and Rodgers took second place. <AP Photo/Alexander F. Yuan>