Canada's Andre De Grasse sets new national record to win 200m Jodie Williams reaches 400m final after massive PB of 49.97secs Laura Muir into 1500m final but Katie Snowden misses out First Dina Asher-Smith, then Adam Gemili and now Katarina Johnson-Thompson. Three of Britainâs biggest athletics stars - and their only two world champions - have seen their Olympic dreams end in injury and tears. Johnson-Thompson had insisted she was fully fit to compete in Tokyo, despite rupturing her Achilles, undergoing surgery, missing three months of training and only competing at three events since belatedly returning to action this summer.