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Duncan Keith is the Blackhawks' best defenseman.
As such, he will have to slow down the Bruins offense. It will not all be on his shoulders, but since he is going to have the puck on his stick when the Blackhawks are coming out of their own zone more than any other player, he must play well if Chicago is going to take home the Stanley Cup.
Keith is used to the responsibility of leading the defense, stopping the other team's most dangerous players and activating the attack once he crosses the opponent's blue line.
What will make it quite difficult in this series is the size and strength of the Bruins forwards. When big men like Milan Lucic, Nathan Horton, Jaromir Jagr and Shawn Thornton start hammering away at Keith with big hits, it could take quite a bit out of his game.
Keith is not small at 6'1" and 200 pounds, but Lucic (220 pounds), Horton (229), Jagr (240) and Thornton (217) are all much bigger.
Keith has scored 11 points and has a plus-six rating heading into the Stanley Cup Final. He is averaging more than 25 minutes per game thus far, and that figure may need to increase against Boston.
He is going to have to be ready for a battle with heavyweights.