Produced by Coleman Hodges.
Reported by Karl Ortegon.
Giles Smith looked so strong the whole race, but it was Tom Shields who took the win in 52.22 by five hundredths over Smith. Following up behind them were Henrique Martins (52.56) and Santiago Grassi (52.71), the only other swimmers to break 53 seconds.
Geoff Cheah of Hong Kong took the B final in 53.73, edging David Nolan by one hundredth.