It was Tkachuk who ignited the fireworks at the start of the United States’ 3-1 win against Canada on Saturday in Montreal, fighting Canada forward Brandon Hagel at puck drop. This after he scored twice in a 6-1 win against Finland in the tournament opener for the U.S.

Matthew Tkachuk left the United States' 4 Nations Face-Off victory over Canada because of what coach Mike Sullivan called a lower-body injury.

The USA star appeared to get injured at some point in the third period of the round-robin game against Canada at the 4 Nations Face-Off. Tkachuk took a few shifts in the early parts of the frame, but he did not appear the final 12 minutes of the game.