The Toronto Maple Leafs professional baseball team played their home games at Diamond Park from 1901 through 1907. The team moved to Diamond Park from Hanlan’s Point Stadium to make it more convenient for fans to attend games on the mainland instead of taking the ferry to watch games on the island.

The ballpark was located at the south-east corner of Liberty Street and Fraser Ave. and Toronto played its first game at Diamond Park on May 10, 1901 against the Worcester Quakers before 5,200 fans. A reserved ticket for the game cost 50 cents but unfortunately the Maple Leafs lost the game 6–5.

Toronto won two Eastern League pennants and finished second on two other occasions while playing at Diamond Park. The team was managed by Ed Barrow in 1901-1902 as well as 1906. Barrow used his experience with Toronto to go on to a Hall of Fame career with the New York Yankees as Business Manager and General Manager of the club.

The Maple Leafs moved back to Hanlan’s Point in 1908 but returned to Diamond Park for the end of the baseball season in August 1909 when the ballpark at Hanlan’s Point burned to the ground. Diamond Park was demolished in 1911 to make way for the E W Gillett company’s office and factory.

Today, Diamond Park is the only Maple Leafs ballpark without a Heritage Toronto plaque.

If this campaign is a success, a plaque with images of the Maple Leafs and Diamond Park will be placed near the stadium site at Liberty Street and Fraser Avenue.