Midway through the evening, Zhang celebrated a clean jump by striking a kung fu crane pose — a la Ralph Macchio's character in "The Karate Kid" — drawing cheers and laughter from the Chinese fans. Moments later, Lyu took the lead in the javelin throw and the stadium roared. Wang Jianan, a fresh-faced 19-year-old kid from northeastern Liaoning province, shook off a hamstring injury to win the bronze in front of another boisterous crowd, China's first-ever medal in the event. Su Bingtian, meanwhile, not only became the first Asian sprinter to reach the men's 100-meter final at the world championships, he and his teammates also captured a startling silver in the 4x100 relay behind Usain Bolt and the rest of the Jamaican squad. [...] race walker Liu Hong finally broke through to win gold in the 20-kilometer walk — the country's only title at the world championships — after taking home silver and two bronzes at the last three worlds.