Dylan Koo, 17, reacts after his 50m freestyle race. He finished first in the 15-17 age group with a timing of 23.48. (Photo © Chua Kai Yun/Red Sports)

Dylan Koo, 17, reacts after his 50m freestyle race. He finished first in the 15-17 age group with a timing of 23.52 seconds. Dylan was among a whole host of local swimmers who clocked PBs in this event, either in the morning heats or evening finals. Dylan himself swam a 23.48s in the heats for a new PB, while Benedict Boon (23.84s, final), Nathan Wong (23.93s, heats) and Jonathan Tan (23.98s, final) were three others who made notable improvements. (Photo 3 © Chua Kai Yun/Red Sports)