Shuttleworth married Matilda White in 1862. By that time, he had been named president of the Maple Leaf club, which played three further games against the Woodstock side between 1862 and 1864, losing each time. The Canadian Base Ball Association was founded in 1864, with Shuttleworth as its first vice-president; By 1865, Shuttleworth was joined by his brother James on Maple Leaf, and won a vote to remain the team's president. In one June 1865 game against West Flamboro, he scored six runs and was described as "particularly agile on the occasion" as Maple Leaf won 34–11. The Shuttleworth brothers each played in the club's victories against Maple Leaf of Guelph, Niagara, the Newcastle Beaver, and Ingorsoll before a game with the Woodstock team was called off because of a dispute over which baseball to use. In 1866, the start of Maple Leaf's season was delayed, as Shuttleworth and at least two other players had joined the Thirteenth Battalion and were defending Hamilton during the Fenian raids. On August 9, he was injured during a game against the Beaver and had to leave an eventual 75–44 loss in the third inning. He returned to the team by mid-August, scoring three runs in a win against Ingersoll.