Chinese shot putter Gong Lijiao, sprinter Wei Yongli, high jump athlete Wang Yu, sprinter Su Bingtian, Greek pole vaulter Katerina Stefanidi, German javelin thrower Thomas Rohler, American sprinter Christian Coleman and Qatari 400 meters hurdles athlete Abderrahman Samba (L to R) pose for photos during the press conference one day ahead of the 2019 IAAF Diamond League in east China's Shanghai municipality on May 17, 2019. (Xinhua/Ding Ting)?