2003–04 NHL season
The first-round Eastern Conference matchups were notable for the number of heated rivalries. The Ottawa Senators met the Toronto Maple Leafs for the fourth time in five years in the always passion-filled Battle of Ontario. The Boston Bruins and Montreal Canadiens met in a resumption of the most common of all NHL playoff series, and one which the Canadiens have thoroughly dominated, including an upset win two years prior. The Philadelphia Flyers also played a hated division rival in the New Jersey Devils. The only non-rivalry was the Tampa Bay-New York Islanders series.