The Senators know that Game 4 on Tuesday night is a crucial one. It's a chance for them to really put the Canadiens in a hole and take a commanding 3-1 series lead. "Right now, (the momentum) is nowhere, it's a day off," Erik Karlsson said Monday. "The next one is a totally different game. We know the third one is harder to win than the second one. We have to come out like we did (Sunday), but even better. They want to prove they're the better team."