At the 2018 Commonwealth Games, Peaty defended his 100 metre breaststroke title, winning in a time of 58.84 seconds after setting a games record time in the semi final of 58.59, beating his team mate James Wilby in to silver medal position and his old rival van der Burgh in to bronze. However, he finished second in the 50 metre breaststroke behind van der Burgh, the first time he had failed to win a 50 metre breaststroke race for 4 years since he lost to him at the 2014 Commonwealth Games. He also helped his England team win a silver medal in the 4 × 100 metre medley relay with Luke Greenbank, Guy and Proud.