Top moments from the Tokyo Olympics opening ceremony

After a dance- and music-filled opening, some of the Olympic athletes from the 205 participating countries marched into the stadium for the hourslong "Parade of Nations" segment of the ceremony.

The parade has been part of the opening ceremonies at the Games since the 1908 Summer Olympics in London. Traditionally, each nation chooses just one flag-bearer for the parade. But this year, countries were actively encouraged to select both a male and female representative to carry their flag.

For the first time in Olympic history, countries entered in alphabetical order according to their names in the Japanese language, using the katakana alphabet.

However, the first team to enter is always Greece because that's where the ancient Games originated in 776 B.C.

This year, the second team to enter was the special team of refugee athletes put together by the International Olympic Committee. The team's name, IOC, is ahead of every other alphabetically in katakana.

Syrian-born swimmer Yusra Mardini and Eritrean-born long-distance runner Tachlowini Gabriyesos were selected to carry the special flag for the Refugee Olympic Team during the lap of the stadium.

With Russia's team name, flag and national anthem banned from the next two Olympics over allegations of a state-backed doping program, the country's athletes marched into the stadium this year with the Olympic flag and under the name ROC, an acronym for Russian Olympic Committee.

It's the second time that Russia has not been able to use its own name, flag or anthem at the Games. During the 2018 Winter Olympics in Pyeongchang, Russia's team was branded as OAR, an acronym for Olympic Athletes from Russia.

Among the athletes marching in for Syria was 12-year-old table tennis player Hend Zaza, the youngest athlete at the Tokyo Olympics.

Zaza was one of the two flag-bearers for Syria's team.

Team USA was third-to-last to enter. Basketball player Sue Bird and baseball player Eddy Alvarez were the flag-bearers.

Bird, a 40-year-old point guard for the Seattle Storm, is the oldest player in the Women's National Basketball Association. Born in New York, Bird holds duel U.S.-Israeli citizenship. She has won four Olympic gold medals.

Alvarez, a 31-year-old infielder for the Miami Marlins, has also been to the Olympics before but not for baseball. Prior to his professional baseball career, Alvarez won a silver medal in the 5,000-meter relay in speed skating with Team USA at the 2014 Winter Olympics in Sochi. Born in Miami to Cuban immigrants, Alvarez became the first Winter Olympics athlete and the first non-baseball Olympian since Jim Thorpe to play Major League Baseball following his MLB debut in August 2020.

The last team to enter is always the host country, which is Japan for these Games. Wrestler Yui Susaki and basketball player Rui Hachimura carried the Japanese flag.

Born in Japan's Toyama prefecture, Hachimura is a 23-year-old forward on the Washington Wizards in the National Basketball Association.

Crowds similar to what is typically seen outside major political summits gathered near the venue as the opening ceremony began. While the crowds aren’t massive, they are vocal.

The chants, police whistles and loudspeakers could even be heard inside the stadium. 

The mood inside the nearly empty venue was described as solemn by ABC News reporters in attendance and a bit like a dress rehearsal due to the absence of spectators.

As the athletes marched in, however, they were said to be in good spirits despite not being greeted by live applause. 

The Olympics host city of Tokyo is currently under a state of emergency order as new COVID-19 cases have spiked in the lead-up to the Games. Many locals have expressed fears that the games will spark a surge in cases, and polls show a majority of the Japanese public were against hosting the Games this year.

The government and organizers, however, doggedly forged ahead.

On the eve of the opening ceremony, Tokyo health officials reported a nearly six-month high in new COVID-19 cases. Some 1,979 new cases were reported, the highest single-day figure since January.

The opening ceremony kicked off with a dance inspired by how sports can bring people together after a difficult year marked by a global pandemic.

Bright, moving lights filled the empty venue and the rhythm was meant to imitate a heartbeat as dozens of Japanese performers pranced across the stadium. 

Arisua Tsubata, a boxer and nurse who treated COVID-19 patients, helmed the opening dance performance from a treadmill in the center of the stadium grounds. 

Following the colorful dance event, the Japanese national anthem was sung by artist MISIA as the as the iconic flag was raised by members of Japan's Self-Defense Forces.

Japan’s Emperor Naruhito was in attendance, taking on the same role his grandfather held when he opened the Tokyo Olympics in 1964.

The ceremony then featured percussive performances meant to honor traditional Japanese carpentry arts. Beloved Japanese tap dancer Kazunori Kumagai also made a cameo performance. 

Fireworks erupted over the stadium, lighting up the sky and officially commencing the Summer Olympics.

The opening ceremony for the 2020 Summer Olympics has begun in Tokyo.

The event at Tokyo's Olympic Stadium will feature a lighting of the Olympic cauldron, a parade of some of the athletes and plenty of music.

The stands are virtually empty with less than 1,000 people actually seated in the venue, which can hold up to 68,000. But millions of viewers are watching from at home.

In attendance are approximately 6,000 athletes and team officials, 900 Games stakeholders and guests of honor along with 3,500 members of the press. U.S. first lady Jill Biden is among the dignitaries in the stands.

No spectators are allowed to attend the opening ceremony -- or any event in an Olympic venue in Tokyo during the Games -- as part of efforts to reduce the risk of COVID-19 infection.

The Tokyo Olympics organizing committee and the Japanese government have faced criticism for pushing ahead with the Games this year, despite public health concerns amid rising COVID-19 cases. The opening ceremony is already mired in controversy of its own, with the latest incident happening on the eve of the event. The Tokyo Olympics organizing committee fired the ceremony's director, Kentaro Kobayashi, over a joke he made about the Holocaust as a comedian in 1998.

"We have been preparing for the last year to send a positive message," Seiko Hashimoto, president of the Tokyo 2020 organizing committee, said during a press conference Thursday. "Toward the very end now there are so many incidents that give a negative image toward Tokyo 2020."