China’s 13-year-old swimming prodigy Yu Zidi has stamped her mark all over the Asian Games and she could cause a sensation at the Los Angeles Olympics in two years’ time. The schoolgirl won all three individual races she swam this week in Tokyo with Asian Games records – a series of performances that belied her tender age. Out of the pool, she has proved herself to be a typical teenager, joking around with teammates and freezing when asked about herself in interviews. She will be 15 when the LA...