Whakaotihia te rerenga e whai ake nei: I te tau 2017, i whakataetae a Sun i te Whakataetae o te Ao. I te
200 mita freestyle, Sun riro koura ki te wa o 1:44.39, te whakatakoto i te rekoata hou Āhia me Hainamana motu. I roto i te 400 mita freestyle, riro ia koura ki te wa o 3:41.38, mutu 2.47 hēkona i mua o runner-up Mack Horton, me te wikitoria i tona toru o te raupapa 400 mita freestyle taitara ao. I mutu a Sun i te tuarima i te 800 mita freestyle, kaore i kaha ki te tiaki i tana taitara. I whakamutu ia i te 1500 mita ārai.