China’s teenage swim sensation Yu Zidi completed a golden Asian Games debut with a record-setting victory in the women’s 200 metres butterfly in Japan on Sunday. The 13-year-old led from start to finish at the Tokyo Aquatics Centre, as China’s dominant swimmers added more gold to a day that had quickly become full of it. Yu’s time of two minutes, 5.08 seconds sliced almost half a second off the previous record, set by compatriot Zhang Yufei at the Hangzhou Games three years ago. It was also 0.63...