 In October, Mattaboy was moved up to Group One class for the first time in the Middle Park Stakes over six furlongs at Newmarket Racecourse.Ridden by Robert Armstrong's brother-in-law Lester Piggott he started the 7/1 fifth choice in the betting behind Bel Bolide (winner of the Gimcrack Stakes), Cooliney Prince (Windsor Castle Stakes), Goodbye Starter and Band Practice (runner-up in the Phoenix Stakes).The other four runners were Parkdale and Poldhu who had finished second and third in the Gimcrack, and the outsiders New Years Day and Von Erlach.