The last time the United States played China in the Women's World Cup was in the 1999 final at the Rose Bowl, when the Americans won on penalty kicks for their second title and Brandi Chastain famously ripped off her jersey.
The teams meet again Friday night, with the winner advancing to a semifinal against top-ranked Germany or No. 3 France, and the Americans still are seeking their third title.
The United States has a 24-game unbeaten streak against China dating to 2003.
After scoring just six goals in their first four games, the Americans look to Alex Morgan for offense. The 25-year-old star forward was sidelined by a bone bruise in her left knee from April 11 until June 8, made her first start of the tournament in the group-stage finale against Nigeria and scored her first goal in Monday's 2-0 round-of-16 win over Colombia.
"I feel better and better each game," Morgan said. "I'm seeing my speed, my change of direction, my shot coming back. It feels good and hopefully in the next games it will feel great."
The Americans will be missing midfielders Megan Rapinoe and Lauren Holiday, suspended because of yellow card accumulation. Morgan Brian, 22, and 26-year-old Christen Press are likely to take their spots in the starting lineup against China.
Rapinoe has been one of the most creative and dangerous players in Canada, while Holiday has been steady and dependable.
"They're definitely both incredible players, great for our team. They're going to be missed, for sure," fellow midfielder Carli Lloyd said. "But it is what it is. We kind of have to get on with it. We can't really dwell on the fact we won't have them out on the field."
THE REPLACEMENTS: Coach Jill Ellis has said Brian will likely replace Holiday in the middle of the midfield alongside Lloyd, while it's widely expected Press will start in Rapinoe's left flank spot.
Brian is the youngest player on the U.S. team.
"Mo has played significant minutes in our games," Ellis said. "We've partnered her specifically with Carli and Lauren at times so she could be confident in that position. She's a tremendous ball distributor, good on services, so we have other options there for us."
Ellis could slide Tobin Heath to the left flank and use Press on the right. Press started against Australia in the team's World Cup opener and scored a goal.
Veteran Heather O'Reilly is also available.
BRANDI ON THAT MOMENT: Chastain told The Associated Press that it wasn't that singular moment that was special to her; it was about the process of getting there.
"I liked the outcome, of course. We all enjoyed the outcome. But when I look at that picture or I remember that PK, I think of the months and years in advance, a lifetime of dedication to the sport I love, to be the best athlete I could at that moment," she said.
SCOUTING CHINA: China advanced to the knockout stage by finishing second to host Canada in Group A. After falling 1-0 to the Canadians on Christine Sinclair's penalty kick in second-half stoppage time, China beat the Netherlands and played a 2-2 draw with New Zealand.
Wang ShanShan scored early and 16th-ranked China hung on to defeat Cameroon 1-0 last Saturday to open the elimination round. A number of players from the U.S. team attended the match at Commonwealth Stadium.
China has played in the World Cup six times but missed out four years ago in Germany. The Steel Roses have never won a title.
THE U.S. PATH: The United States defeated Australia 3-1 in the tournament opener, with Rapinoe scoring twice. Then came a scoreless draw with fifth-ranked Sweden, one of the top matches of the group stage, before a 1-0 victory over Nigeria to finish atop Group D. The U.S. faced No. 26 Colombia to open the knockout stage, winning 2-0 but scoring only in the second half when Colombia was a player down. Abby Wambach missed a penalty kick during the match.
LOOKING AHEAD: The winner will make the short trip to Montreal's Olympic Stadium for a semifinal Tuesday.
Tenth-ranked Australia, which upset No. 7 Brazil in the round of 16, will face defending champion Japan, ranked fourth, in a quarterfinal match Saturday in Edmonton, Alberta. Host Canada, ranked eighth, plays No. 6 England in Vancouver, British Columbia. The winners will face off in the semifinals in Edmonton on Wednesday.