Just when it appeared the competitive gap was closing between women's hockey powers, the U.S. and Canada ratchet the bar even higher.

Danielle Serdachny converted a rebound in front 5:16 into overtime for a power-play goal and Canada beat the United States 6-5 in a breathtaking women’s world hockey championship gold medal game.

Emily Clark scored twice, including the go-ahead goal 5:05 into the third period, and Canada beat the United States 3-1 in Game 1 of a nine-game pre-Olympic Rivalry Series between the national women’s hockey teams Friday night.