Brad Marchand is well-known as a hated player around the league. So, it means a lot when he reveals who the Boston Bruins as a team think is their biggest rival. It is commonly thought that the Bruins and Montreal Canadiens have one of the longest-standing rivalries in the NHL, however, Marchand has revealed that he thinks the Bruins and Leafs rivalry has surpassed it.
While this sounds like a massive deal, however, it's not surprising coming from Marchand. He and the Leafs got into some good dust-ups during their last matchup in the regular season.
Marchand will probably use this to his advantage during the series, as this is exactly what makes him a great hockey player. His ability to perform at a high level while getting under opposing players' skin is why he has had such an illustrious career in the NHL.