<prompt> Chang akaita mutambo wake wekutanga weOlympic, semumhanyi mudiki weSouth Korea ane makore gumi nemana, kumaOlympics ezhizha ra2000 muSydney. Ikoko, akakundikana kuenda kumasemifainari mumitambo yake yega yega, achipedza makumi mana mu100 m freestyle 58.77, uye makumi mana nemumwe mu50 m freestyle  <response>: 26.88. Akaisawo gumi nemanomwe, senhengo yechikwata cheSouth Korea, mu4 × 100 m medley relay 4: 16.93. 