Discipline could be a decisive factor for each team; Boston has taken 37 minor penalties, the most of any playoff team. Carolina has committed 30 (tied for fifth). The Bruins hold a 6-5 advantage in power-play goals.
"When you get evenly matched teams," Bruins coach Bruce Cassidy said, "there's a couple instances a game that can turn the tide."
Carolina scored twice in nine power-play chances in a 5-2 win in Game 2, and Boston went 2-for-9 with the man advantage in a 5-2 win in Game 4.
"Like always, every game has come down to the special teams," Hurricanes forward Andre Svechnikov said. "But also, you've got to play 5-on-5 really good."