Canadian fans booed the American national anthem when the teams met in a round-robin match in Montreal, which was followed by three fights in the first nine seconds of the game.

The 4 Nations Face-Off Final between Canada and USA, a thrilling contest won by the Canadians in overtime, was a massive boon for the sport of hockey and its viewership.

Thursday night's USA-Canada championship game at the 4 Nations Face-Off showed viewers' appetite for best-on-best international hockey. ESPN said the game, which Canada won 3-2 in overtime on a goal by Edmonton Oilers star Connor McDavid, averaged 9.3 million viewers, its biggest hockey audience ever. It peaked at 10.4 million.