Team USA's top line finally had the explosive game they've been waiting for, while Czechia held on to send Canada packing.

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The winner will clinch the top seed and a Thursday quarterfinal meeting against Switzerland, the bottom seed in Group B. The loser could drop to third place behind Finland. The defending champion USA beat Germany and Latvia and lost to Finland in overtime.

Danny Nelson scored the eventual game-winner in the third period and Trey Augustine made 38 saves, leading the United States to a 4-1 win over Canada and into the top spot in Group A at the world junior hockey championship.

Defending champion USA, playing on back-to-back days, fell to Finland in overtime Sunday for its first loss at the world junior hockey championship.

Boston College teammates James Hagens and Ryan Leonard each scored twice and the defending champion United States routed Switzerland 7-2 on Thursday in the world junior hockey quarterfinals

The defending champion United States will face Switzerland in the quarterfinals of the world junior hockey championship. What to know about the game:

BC teammates James Hagens and Ryan Leonard each scored twice and the defending champion United States routed Switzerland 7-2 on Thursday to reach the semifinals of the world junior hockey championships.