Jakub Voracek and Wayne Simmonds added goals, and Steve Mason made 32 saves to help Philadelphia improve to 12-2-1 in its last 15 games to maintain its hold on second place in the Metropolitan Division.
Jaden Schwartz opened the scoring 6:23 into the game, finishing a 2-on-1 short-handed opportunity after taking a feed from Kevin Shattenkirk. Schwartz's wrist shot from close range went under the glove of Mason.
St. Louis needed one point in the game to become the first Western Conference team to clinch a playoff spot.
After being through it and seeing the other [outdoor] games on TV, just the atmosphere is spectacular. To stand here -- and we are essentially almost on the blue line -- and look up [into the stands] and knowing it is going to be packed and playing our biggest rival in this setting is going to be pretty special.
— Bruins president Cam Neely on the 2016 Bridgestone NHL Winter Classic between Boston and Montreal at Gillette Stadium on
Jan. 1, 2016