<prompt> Pedzisa mutsara unotevera:  <response>: varume 100 m shavishavi pa 2012 Summer Olympics muLondon, nokudzikatidza FINA B-mureza kupinda nguva 52.45 masekonzi. Akadenha vamwe vanoshambira vanomwe mukupisa kwechitatu, kusanganisira mutambi weOlympic kanokwana kashanu Peter Mankoč weSlovenia, shasha yefreestyle relay Clement Lefert weFrance, uye aimbova mumhanyi weOlympic Ryan Pini wePapua New Guinea. Chang akamhanya kunzvimbo yechishanu nechikamu chezana chechipiri 0.01 shure kwaPini munguva yemasekondi 52.69. Chang akakundikana kuenda kumasemifinal, sezvo akaisa makumi maviri nematanhatu pakupedzisira mumakwikwi ekutanga. 