This year's Stanley Cup finals are the most-watched through four games since at least 1994, according to the Nielsen Company.
The best-of-seven series, telecast on NBC, is averaging 5.356 million viewers.
The Chicago Blackhawks' 6-5 overtime victory over the host Boston Bruins in Game 4 on Wednesday averaged 6.459 million viewers. That is the most of any Stanley Cup finals Game 4 since the introduction of People Meters in 1987.
Viewership of the game peaked at 8.192 million during overtime.