Game 4 has drawn the third-largest audience for the Stanley Cup Final on NBCSN.
The Chicago Blackhawks' 2-1 win over the Tampa Bay Lightning on Wednesday night averaged more than 3.9 million viewers.
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NBC said Thursday that was up 16 percent from the nearly 3.4 million for last year's Game 4 between the Los Angeles Kings and New York Rangers, which was a potential clincher.
The only two games with bigger audiences came in the 2013 series between the Blackhawks and Boston Bruins.
NBC is part of Comcast Corp.