Moss is New Zealand’s top ranked swimmer. He was a gold medalist at the Melbourne Commonwealth Games in the 200m butterfly and bronze in the 100m butterfly. He was fourth in the final of the 200m fly at 2007 World Championships and won 2008 FINA World Short Course in final over the same distance at Manchester. He broke his own national record and regained the Commonwealth record at the Olympic trials in 1:54.99 in the 200m fly.