Pedzisa mutsara unotevera: Sun akakwikwidza achimiririra China paMitambo yeOlympic ya2008. Muna 2010, akakunda 1500 metres freestyle paAsia Games, achiisa rekodhi idzva reAsia. Mumakwikwi e2011 World Championships, akarova 1500 metres freestyle rekodhi yenyika, iyo yakambobatwa naGrant Hackett muna 2001 uye rekodhi yenyika yakareba kwazvo mukushambira panguva iyoyo. Sun akahwina menduru dzendarama mumakwikwi e400 uye
1500 metres freestyle kumaOlympics a2012. Pa2013 World Championships, akava wechipiri kushambira, mushure meHackett, kuhwina menduru dzegoridhe mumitambo mitatu yakareba yemahara (400, 800, uye 1500 metres) mumutambo mumwe chete weWorld Championship.