Pedzisa mutsara unotevera: Pamitambo yeOlympic yeZhizha ya2016, Sun akakunda mumakwikwi emamita mazana maviri akasununguka nenguva ye1:44.65, achipedza masekondi 0.55 pamberi pemumhanyi wechipiri Chad le Clos. Yaiva zita rokutanga guru renyika yose raSun mumutambo uyu, uye akava mutambi wokutanga weChinese kuti akunde menduru yegoridhe mumutambo uyu. Akakunda menduru yesirivha mumamita mazana mana akasununguka aine nguva ye3: 41.68, achipedza 0.13 masekondi kumashure kwaMack Horton weAustralia. Zuva rakapedza riri rechi16 mumakwikwi okutanga e
1500 metres freestyle, achiverenga nguva pa 15:01.97. Nemenduru yake yegoridhe yemamita mazana maviri yemahara uye menduru yake yegoridhe yemamita mazana mana nemakumi mashanu emamita kubva kuma2012 Summer Olimpiki, Zuva rakava wekutanga kushambira munhoroondo kuhwina menduru yegoridhe yeOlympic mumitambo yemamita mazana maviri, mazana mana, uye mazana mashanu emamita.