Dylan Koo reacting after finishing second in the Men's 100m Butterfly final on the third day of the 13th Singapore National Swimming Championship. (Photo © Stefanus Ian/Red Sports)

Dylan Koo reacting after finishing second in the Men’s 100m Butterfly final on the third day of the 13th Singapore National Swimming Championships. He clocked a time of 54.24s in the final, but registered a personal best of 54.17s in the heats. (Photo 11 © Stefanus Ian/Red Sports)