Second placed China's team Mo Youxue, Xie Zhenye, Su Bingtian and Zhang Peimeng (L-R) celebrate as the crow sing happy birthday to Su Bingtian after the men's 4x100 meters relay final during the 15th IAAF Championships at the National Stadium in Beijing, August 29, 2015. [Photo/Agencies]

Zhang Peimeng reacts after finishing the third in the men's 4x100 meters relay final at the 15th IAAF World Championships at the National Stadium in Beijing, August 29, 2015. [Photo/Xinhua]