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OTTAWA, ON - APRIL 21: David Pastrnak #88 of the Boston Bruins stickhandles the puck against Erik Karlsson #65 of the Ottawa Senators in the first period in Game Five of the Eastern Conference First Round during the 2017 NHL Stanley Cup Playoffs at Canadian Tire Centre on April 21, 2017 in Ottawa, Ontario, Canada. (Photo by Jana Chytilova/Freestyle Photography/Getty Images)

OTTAWA, ON - APRIL 21: David Pastrnak #88 of the Boston Bruins stickhandles the puck against Erik Karlsson #65 of the Ottawa Senators in the first period in Game Five of the Eastern Conference First Round during the 2017 NHL Stanley Cup Playoffs at Canadian Tire Centre on April 21, 2017 in Ottawa, Ontario, Canada.  (Photo by Jana Chytilova/Freestyle Photography/Getty Images)