When listing Boston’s biggest sports rivals, Toronto has not historically been the first city that rolls off the tongue. But there’s a budding rivalry between the cities, one that heated up over the weekend when the Maple Leafs came back for two wins over the Bruins and the Blue Jays won their series with the Red Sox. The Bruins and Leafs will face off in Game 7 Monday night. Feuds between players, between coaches, and between a manager and his former city have turned up the volume on the rivalry, as has this sign made in poor taste by a Leafs fan. Which city has the historical advantage, and which has the edge going forward? We break down the matchup.