The 16 year old, who has a handicap of 14, was playing in his first Croquet Association tournament and went on to win all of his seven games.
This weekend Chang and his team-mate Jamie Waldron will represent the club at the prestigious All England National Croquet Finals.
Meanwhile, Audrey Whitaker won the Cope Cup at a recent tournament in Poole.
Daniel Mills won the Longman Cup for B Level singles at Budleigh Salterton with seven wins out of seven. He also won the handicap singles in Bowden, near Manchester.
Mills’ handicap has improved from 4 to 1.5 and he is now ranked in the top 150 in the UK.
Club colleague Louise Bradforth has moved up to 93rd in the UK.