Yu Zidi is only just into her teens, but the young swimming sensation is already a National Games champion – emphatically so, after smashing an Asian record set before she was born to win the women’s 200 metres individual medley on Tuesday. She gave notice of her promise at the summer’s world championships in Singapore, collecting a relay medal and threatening the podium in her individual events. And Tuesday’s medley final in Shenzhen saw her storm to gold for Hebei in two minutes and 7.41...