China’s Su Bingtian, Asia’s fastest man, announced his retirement from athletics on Tuesday, saying his body had told him to “pass the baton”. But Su said he had shown Chinese sprinters that “everything is possible” as he reflected on a career in which he was the first from his country to break the 10-second barrier for the 100 metres. The breakthrough came when Su ran 9.99 seconds in 2015 at a Diamond League meet in Oregon, in the United States. He also became the first Chinese man to reach an...