The Lawn Tennis Club in Toronto, the second-oldest tennis club in the world, next to Wimbledon, established in 1876, hosted the first Open Era tournament in Canada in 1968. It was a women's competition, and Jane BARTKOWICZ won the inaugural title. A year later, the first men's tournament was held here, with Cliff RICHEY winning the title. For the next six years, the tournament alternated venues with another local tennis club, as it does today between Toronto and Montreal.

Since 1970, the Cricket Skating and Curling Club, like the club it alternately hosted the Canadian Open with, has played on clay. The first champions were legendary Australian tennis players Rod LAVER and Margaret COURT, who were at the peak of their professional careers in the late 1960s and early 1970s. Today, this club, with a storied history dating back to 1827, when the founders began cultivating cricket, is one of the city's most renowned multi-sport centers for family recreation.

The National Tennis Centre in Toronto operated from 1976 to 2003 on the Keele Campus of York University. It served as the home base of Tennis Canada and the permanent venue for the Canadian Open in Toronto. The main outdoor stadium (Stadium Court) held approximately 10,000 spectators, while the second show court held approximately 2,000. Since 1976, matches have been played on clay courts. However, in 1979, the surface was replaced by Har-Tru hardcourts to meet the standards of the US Open at the time and to provide a level playing field for players ahead of the American major.

In 1981, the Canadian Open left Toronto for the first time, hosting the men's tournament in Montreal at Jarry Park Stadium. The local baseball team moved to a new location, and the first matches were held on courts installed right on the former baseball field. From this year, the annual rotation of men's and women's tournaments began, and women's competitions were held in Toronto. In 1987, the stadium was renamed Du Maurier Stadium for commercial reasons. In 1996, after a large-scale reconstruction, the stadium became a modern tennis complex with a central court seating approximately 10,500. In 2004, the stadium was renamed after Uniprix, a pharmaceutical giant in Quebec. In 2018, Tennis Canada, the owner of the complex, renamed the arena to IGA Stadium, under a rights contract with Empire Company, a Nova Scotia-based conglomerate.

The tournament's growing popularity and the resulting increase in attendance led to the realization that the stadium needed a major renovation. In 2003, the old National Tennis Centre was demolished. In 2004, a new, modern sports and entertainment complex was built in its place. The new facility was named the Rexall Centre, under a contract with the Canadian pharmacy chain Rexall. In 2015, the stadium was renamed after a contract was signed with the large insurance company Aviva. In 2022, the complex received its current name, Sobeys Stadium, after Empire, the owner of the Sobeys supermarket chain, purchased the rights. In addition to its main purpose of hosting the tournament, The Bowl at Sobeys Stadium, a large open-air concert venue, was opened on the stadium grounds for various concerts and shows.

Centre Court at IGA Stadium is located in historic Jarry Park, directly on the site of the former baseball field, which was previously home to the Montreal Expos. The tennis complex opened in August 1996. At its opening, Center Court had a seating capacity of approximately 10,500. In 2001, Tennis Canada invested in increasing the seating capacity, bringing the total to approximately 11,750. In 2001, minor upgrades to the press box, media boxes, and photographers' areas finalized the arena's configuration, bringing the total seating capacity to 11,815. All Centre Court tickets also provide access to Level 200 on the second-largest Rogers Court and all other additional or practice courts of the stadium on a first-come, first-served basis. Centre Court is covered in DecoTurf, the same surface used at the US Open.

Centre Court, the most famous octagon in Toronto, located at Sobeys Stadium, opened in 2004 and became one of the two main arenas for the tennis tournament in Canada. Since then, the court has a capacity of 12,500 spectators. During concerts, the capacity can reach 18,000 people, depending on the stage. For decades, the court was covered in DecoTurf, the same surface used in Montreal and at the US Open. Although the arena is designed specifically for tennis, it regularly hosts other major events. In 2015, it hosted the Pan American Games. Every summer, the court is used by York University for its graduation ceremonies.