Substitute Chioma Ubogagu scored early in extra time on Friday as the United States beat North Korea 2-1 to advance to the semifinals of the women's under-20 World Cup, while defending champion Germany coasted to a 4-0 win over Norway to also reach the last four.
Ubogagu headed in Crystal Dunn's pass in the 98th minute to send the U.S. to a semifinal matchup with Nigeria on Tuesday. The North Koreans pressed after Ubogagu's goal but couldn't find an equalizer in the remaining 22 minutes of extra time.
"We knew it was going to be a competitive match and it was," U.S. coach Steve Swanson said. "I have a lot of respect for North Korea, they played a great game. Our players played a tremendous game and we're happy to be moving on."
Vanessa Di Bernardo gave the U.S. a 1-0 lead in the 52nd minute when she took control of a failed clearance and fired a long-range shot from 23 metres past North Korean goalkeeper O Chang Ran.
Substitute Kim Su Gyong levelled for North Korea in the 75th when she took a pass and beat U.S. goalkeeper Bryane Heaberline with an angled shot into the top corner.
Both teams had several good scoring chances in the first half.
North Korea went close midway through the first half on a long-range shot by Jon Myong Hwa that forced Heaberlin into a diving save. The U.S. had several good scoring chances late in the first half, the best coming on a header by Morgan Brian that was just wide of the far post.
A large contingent of ethnic Koreans living in Japan occupied a section of the stadium that was separated from the other fans in attendance.
In Friday's first quarterfinal, Germany, bidding to become the first team to win consecutive titles, took control with three goals in the first 20 minutes.
Lena Lotzen opened the scoring in the fifth minute when she converted a perfect cross from Dzsenifer Marozsan and Melanie Leupolz doubled the lead just two minutes later, picking up a rebound and firing past Norway goalkeeper Nora Gjoen.
Lotzen made it 3-0 with a superbly struck left-footed shot in the 20th.
"The most important thing was who would score first and we were able to do so and that set the tone," German coach Maren Meinert said. "We played them before and knew they were not playing well against us."
Norway was reduced to 10 players when Caroline Hansen was sent off for a high challenge on goalkeeper Laura Benkarth in the 80th and Luisa Wensing completed the scoring five minutes later with a header past Gjoen.
Germany will face Japan in the semifinals on Tuesday. Japan's senior women's team beat Germany 1-0 in the quarterfinals of the 2011 World Cup in Wolfsburg before going on to claim the title but Meinert said revenge is not something that motivates her team.
"I haven't thought about getting revenge," Meinert said. "Japan has improved a lot and we expect a tough match from them."