Rubuta ci gaba ga wannan sakin layi - Chang ya cancanci zuwa maza 100 m butterfly
a Wasannin Olympics na 2012 a London, ta hanyar haskaka lokacin shigar da daidaitattun FINA B na dakika 52.45. Ya kalubalanci wasu masu iyo bakwai a zagayen na uku, gami da Peter Mankoč na Slovenia wanda ya lashe gasar Olympics sau biyar, zakara na freestyle relay Clement Lefert na Faransa, da tsohon dan wasan karshe na Olympics Ryan Pini na Papua New Guinea. Chang ya yi tsere zuwa matsayi na biyar ta kashi ɗari na biyu (0.01) a bayan Pini a cikin lokaci na 52.69 seconds. Chang ya kasa ci gaba zuwa wasan kusa da na karshe, yayin da ya sanya na ashirin da shida a cikin zafin farko.