Montreal Canadiens
While the Buffalo Sabres rivalry with the Montreal Canadiens is not as prevalent as those listed above, it is nonetheless one of the biggest. Despite a smaller number of incidents, the Canadiens rank #2 on the Sabres list for number of fights, behind only the Bruins. Want more fun? The Sabres also rank #2 on the Canadiens list, with Toronto clocking in at #3 for both teams.
As with the Bruins, the Sabres and Canadiens are quite familiar with one another during the Stanley Cup Playoffs, with the two teams meeting up seven times. The Sabres stand at 3-4 against their division rivals during the postseason, but they did win in their most recent meeting, which occurred back in 1998.
Overall, this rivalry is one of the more physical ones for the Sabres, given the number of fights. But if you are looking for arguably the most competitive rival that the Sabres have, and also one with the biggest brawl, the next team may fit that mold.