FILE - In this Feb. 13, 2013, file photo, Ottawa Senators defenseman Erik Karlsson (65) grimaces as he falls to the ice after colliding with Pittsburgh Penguins left wing Matt Cooke, left, during the second period of an NHL hockey game in Pittsburgh. For the first time since 1973, there is just one Canadian team in the NHL postseason. The Montreal Canadiens represent the nation's only hope of ending a 21-year Stanley Cup drought. (AP Photo/Gene J. Puskar, File)
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