Kammala wannan jumla: A watan Agusta 2018, Sun ya yi gasa a kowane wasan motsa jiki daga mita 200 zuwa mita 1500 a
Wasannin Asiya. Ya kuma yi gasa a wasannin tsere na mita 4 × 100 da 4 × 200 na kyauta. A tseren mita 200 na 'yanci, Sun ya lashe zinare tare da lokacin 1:45.43. Ya gama na 1 a tseren mita 400 na kyauta tare da lokacin 3:42.92, sama da dakika hudu a gaban Naito Ehara. Ta hanyar doke lokacin Horton na 3:43.76 daga Wasannin Commonwealth na 2018, Sun ya zama mai iyo na farko a duniya don wannan taron na 2018. A tseren mita 800 na maza, wanda aka gabatar a wasannin Asiya a karon farko, ya lashe zinare da lokacin 7:48.36. A cikin tseren mita 1500 mai kyauta, ya gama na 1 tare da lokacin 14:58.53, ya doke Nguyễn Huy Hoàng na biyu da fiye da dakika uku. Wannan shi ne karo na farko da Sun ya yi iyo a cikin minti 15 tun lokacin wasannin Asiya na 2014, kuma ya lashe lambar yabo ta uku a jere a wasannin Asiya a tseren mita 1500. Da yake wakiltar kasar Sin, Sun ya taimaka wa tawagarsa ta zama ta biyu a tseren tseren mita 4 × 100 tare da jimillar lokaci na 3:13.29, a bayan lokacin Japan na 3:12.68. A cikin tseren tseren mita 4 × 200, ya taimaka wa China ta lashe azurfa tare da jimillar lokacin 7:05.45, a bayan Japan 7:05.17.