Jeremy Swayman made 21 saves for Boston (28-26-8), which won 3-2 at the Pittsburgh Penguins on Saturday but has lost six of the past seven (1-4-2). David Pastrnak ’s 17-game point streak ended (33 points; 15 goals, 18 assists).

Despite playing back-to-back matinees, the Bruins carried the play for much of the day, but Gustavsson was the star of the show.