The story so far:
Game 1 in Toronto: Sens win 4-3 in OT
Game 2 in Ottawa: Sens win 3-2
Game 3 in Ottawa: Sens win 5-1
Game 4 in Toronto: Leafs win 3-1
Game 5 in Toronto: Leafs win 4-2
Game 6 in Ottawa: Leafs win 5-0
Yes, that's 3-3 so far and ensuring you'll atleast get a tie in the BoO isn't all that's on the line in this game.
A loss for Toronto will pretty much will end the postseason hopes. Three years in a row out of the playoffs. The franchise has never seen those depths before. Ottawa would love to be the team that helps ensure it.