At the 2018 Commonwealth Games, Scott won gold in the 100 metre freestyle in a time of 48.02 seconds. He also won four bronze medals at the Games: in the 200m butterfly, 200m freestyle, 4 × 100 m freestyle relay, and 4 × 200 m freestyle relay, and became the first Scottish athlete to win five medals at the same Commonwealth Games. He added a sixth medal when he won silver in the 200m individual medley.