The Ottawa Senators (optional) and Toronto Maple Leafs skated at Canadian Tire Centre on Saturday.

Toronto Maple Leafs winger Matthew Knies was penalized for cross-checking Ottawa Senators winger Ridly Greig at the end of the second period on Thursday night.

"I kind of took a dumb penalty and little things like that you have to learn," the 22-year-old said following Toronto's Game 3 win. "I just got to keep my stick down there."

The Senators have had seven power-play opportunities in the last two games while the Leafs have had just three. As Toronto looks to complete the franchise's first playoff series sweep since 2001 on Saturday night, discipline is being stressed.

"It's just understanding that, you know, the scrums and all that don't react to it," said Leafs coach Craig Berube. "Play hard between the whistles. I get there's desperation plays sometimes and you take penalties and, you know, that's going to happen in the game, but it's the other stuff. You want to be really good at having composure."

What's the key?

"I don't have an answer for it," the coach concluded. "I mean, it's just the understanding of it."

The Leafs always have pictures and names of the officials posted on the doors of their bench. That started years ago when veteran Jason Spezza encouraged his teammates to be more collegial with the men in stripes.

And discipline for the Leafs also means not complaining about calls when they are made.

"Trying to stay off the refs," said winger Steven Lorentz. "In the heat of the moment sometimes it’s easy to be yelling at guys and the refs are guys too, and the more you are yelling at them they’re probably not going to do you any favours."

Lorentz, who had just two minors in 80 regular season games, was whistled for tripping Tim Stutzle in Game 3.

"I definitely wasn’t trying to get a piece of him on the lower half of the body," Lorentz said. "I was coming through my lane and he cutback and I was........

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