I don’t really follow professional sports, but as a Torontonian, the Toronto Maple Leafs (NHL) are huge here, many southern Ontarians go to Buffalo to watch The Bills (NFL), the media flips out about the Raptors (NBA) - but I don’t know anybody who actually cares about them, and if the Blue Jays (MLB) make it to the playoffs, everyone is miraculously a big fan.
Apparently Toronto now has a North American soccer team - but little is known about them or the league.