Waterjump. steven gardiner of the bahamas pulled up injured in his 400 metressemi—final. gardiner, fastest in the world this year, was well—placed coming off the final bend but stopped, grimacing in pain clutching the back of his leg. former olympic and world champion wayde van niekerk who's also world record holder was the chief beneficiary as he advanced as a fastest loser. italy's olympic champion gianmarco tamberi won the world high jump title in a dramatic finish against young american juvaughn harrison. tamberi who shared the olympic title with three—time world champion mutaz barsh...