U.S. midfielder Julie Ertz, right, kicks the ball past Canada defender Kadeisha Buchanan during the second half of a CONCACAF women’s Olympic qualifying match Sunday in Carson, Calif. The U.S. won 3-0. (AP photo)

CARSON, Calif. — Lynn Williams and the rest of the U.S. women sensed it was just a matter of time before they wore down Canada.

Williams broke open a scoreless stalemate with a goal in the 61st minute and the United States beat Canada 3-0 on Sunday in the title match of the CONCACAF Women’s Olympic qualifying tournament.

“We have a great front line, we have a great midfield. The defenders were doing their job in the first half, so now it was our turn to get the job done in the second half,” Williams said.

Lindsey Horan and Megan Rapinoe also scored for the United States, which extended its undefeated streak to 28 games. The U.S. did not concede a goal in five qualifying matches, and scored 25 times.

The U.S. and Canada had both already secured the region’s two spots in the Tokyo Games with victories in the semifinals. The United States, ranked No. 1 in the world, beat Mexico 4-0 in one semifinal and eighth-ranked Canada edged Costa Rica in the other game on Friday.

The U.S. has been to every Olympics since women’s soccer was included in 1996, and has won four gold medals. But the Americans were knocked out in the quarterfinals by Sweden four years ago in Brazil, the team’s earliest Olympic exit.

Canada has made the field in the past three Olympics, winning the bronze medal in the last two.

It was the fourth time the teams have met in the final of the region’s qualifying tournament, with the United States winning all four.

“In the first half, throughout the whole game, they were very organized, very disciplined. They’re one of the best teams in the world, top 10 in the world, so it’s not going to be easy, if you sit back it will be really hard,” U.S. coach Vlatko Andonovski said.