kwok competed only in the men's 100 m breaststroke at the 2000 summer olympics in sydney. he posted a fina b-standard entry time of 1:05.29 from the hong kong long course championships. he challenged seven other swimmers in heat three, including namibia's three-time olympian jorg lindemeier. he posted a lifetime best of 1:05.28 to pick up a fifth seed by three hundredths of a second (0.03) behind lindemeier. kwok failed to advance into the semifinals, as he placed fiftieth overall on the first day of prelims.