Mayson finished third in the six furlong Cammidge Trophy at Doncaster on his re-appearance as a four-year-old. He gained his first Listed success when winning the Abernant Stakes. Ridden by Paul Hanagan he started at 4/1 and was ridden near the front of the 10-runner field. As they entered the final furlong he took the lead and ran on to win by three and a half lengths from the gelding Jimmy Styles, gaining his first victory for twenty months. He followed this up with his first Group win in the Palace House Stakes two weeks later. He started as the 7/2 favourite and was in the middle of the pack early on in the race. As he had done in the Abernant Stakes, he took the lead entering the final furlong and went on to win by three quarters of length from Definightly, who just beat Elusivity for second place. He finished in last place, tailed off behind winner Tiddliwinks, in the Duke of York Stakes. He then finished in fifth place in the Chipchase Stakes after being hampered with over a furlong left to run.
