This article was written by James Ayello based on reporting from The Associated Press.
Both the U.S. women's soccer team and U.S. men's basketball team advanced one step closer toward Olympic gold Monday.
Although "The Lord of the Rings," China's legendary and nearly unbeatable gymnast, was upset by a lesser-known Brazilian, China remains atop the world's medal leader board after 10 days of games.
Late goal sends U.S. women's soccer to gold medal game
In an instant classic, Alex Morgan's game-winning goal in the final minute of injury time lifted the U.S. past Canada 4-3 to send the women to the gold-medal final against Japan on Thursday.
Morgan's 6-yard header on a cross from Heather O'Reilly helped the U.S. overcome an outstanding day from forward Christine Sinclair, whose hat-trick accounted for all of Canada's goals.
The final against Japan will be a rematch of the 2011 World Cup Final where the Americans suffered a heartbreaking loss on penalty kicks. This is the first time the U.S. has advanced to the gold-medal game since the Atlanta Olympics in 1996.
U.S. men's basketball team remains undefeated
The U.S. men's basketball team emerged with a 126-97 victory over Argentina on Monday night. The win not only keeps the Americans perfect in London but advances them to the knockout stage of the tournament as the top seed.
What was a one-point lead at halftime turned into a blowout after a 42-point third quarter for the Americans led by Kevin Durant.
Durant led the charge for Team USA as he tallied 17 of his 28 points in the tide-changing third quarter. He had eight three-point field goals.
As the top-seeded team in final four knockout stage, the U.S. will face Australia Wednesday.
American pole vaulter wins gold medal
U.S. pole vaulter Jenn Suhr avenged a gut-wrenching defeat to Russian superstar Yelena Isinbayeva in Beijing four years ago to take down the two-time champion and world-record holder and win the gold in the Olympic pole vault final Monday.
Suhr vaulted 15 feet, 7 inches, while Isinbayeva vaulted 15 feet, 5 inches, settling for third place and a bronze medal.
One gymnastics star falters while another shines
Before Monday, Chinese gymnast Chen Yibing had lost a still rings event only once in six years. In that time, "The Lord of the Rings" assembled not only a gold medal in Beijing in 2008, but four of the last five world championships.
But when the final scores were announced Monday, it was Brazilian Arthur Zanetti who came away with the gold, and a shocked Yibing was forced to settle for silver.
Zanetti's gold was Brazil's first medal of any kind in artistic gymnastics in these games.
Six months ago, Russian gymnast Aliya Mustafina, once recognized as the world's best gymnast, was nursing an ailing knee, only able to dream about Olympic gold. But on Monday, Mustafina was able to resume her familiar spot atop the podium as she was deemed champion of the uneven bars.
American Gabby Douglas finished last in the uneven bars competition.
U.S. judo fighter expelled after drug test
American judo fighter Nick Delpopolo has been booted from the Olympics after failing an in-competition drug test. He said he accidentally ate something that had been baked with marijuana. He will forfeit his seventh place finish in the 73-kilogram class.
Delpopolo is the first of 10,500 competitors at the 2012 Olympics to fail an in-competition drug test. Four athletes failed tests for banned substances before competition began.
Not done yet
Serena Williams, who just wrapped up winning gold medals in both the single and doubles Olympic tennis events, said she plans to compete in the 2016 Rio De Janeiro Games.
She said she will defend her singles title "unless an act of God doesn't allow me to."
With career victories in tennis' four major tournaments and with her recent Olympic singles gold, Williams became the fourth player ever to complete a career Golden Slam. Andre Agassi, Steffi Graf and Rafael Nadal did so as well.
Each country added three medals to their total, and the Chinese remain ahead of the United States for a second straight day, holding a one medal lead.
NBC is continuing to refuse to address many Americans' concerns about events appearing on tape delay, and the International Olympic Committee is declining to get involved.
Many Americans are demanding to see more live competition, and some are asking the IOC to intervene, but the committee said it has no interest in getting drawn into the debate. IOC spokesman Mark Adams said, "It's certainly not for us to tell them how to reach their audience."
What to watch
Visit NBC.com for the full schedule of Olympic events Tuesday.
4 a.m. CDT: Equestrian, team dressage, grand prix special, final
5:30 a.m.: Men's triathlon
8 a.m.: Men's gymnastics, parallel bars final
8 a.m.: Women's basketball, U.S. vs. Canada, quarterfinal
8:47 a.m.: Women's gymnastics, balance beam final
9:37 a.m.: Men's gymnastics, horizontal bar final
10:23 a.m.: Women's gymnastics, floor exercise final
Noon: Women's beach volleyball, U.S. vs. China, semifinal
3:15 p.m.: Men's track and field, 1,500-meter final
Find complete coverage of the London 2012 Summer Olympics from The Associated Press.
Supervising editor is Frank Russell.