Key moments from Day 12 of the Olympic Games

Each day, ABC News will give you a roundup of key Olympic moments from the day’s events in Tokyo, happening 13 hours ahead of U.S. Eastern Standard Time. After a 12-month delay, the unprecedented 2020 Summer Olympics is taking place without fans or spectators and under a state of emergency due to the coronavirus pandemic.

Sydney McLaughlin wins gold, sets a new world record in 400m hurdles

Team USA’s Sydney McLaughlin set a new world record of 51.46 seconds for the 400m hurdles and picked up the gold medal along the way. She was congratulated by teammate Dalilah Muhammad who won the silver in the event.

The previous world record for the men’s 400m hurdles was also smashed yesterday by Norway’s Karsten Warholm.

PHOTO: Sydney Mclaughlin, of the United States, wins the women's 400-meter hurdles final at the 2020 Summer Olympics, Aug. 4, 2021, in Tokyo, Japan.

PHOTO: People celebrate during a watch party Tuesday, Aug. 3, 2021, in Mountainside, N.J., the gold medal of Sydney McLaughlin in the women's 400-meter hurdles at the 2020 Tokyo Olympics.

PHOTO: Gold medalist Sydney McLaughlin of Team United States poses in front of the scoreboard after setting a new world record in the Women's 400m Hurdles Final on day twelve of the Tokyo 2020 Olympic Games at Olympic Stadium on Aug. 04, 2021 in Tokyo.

U.S. women’s basketball heads to semifinals, win streak extended to 53

The United States women’s basketball team has now won 53 straight games at the Olympics, a streak extending from the 1992 Olympic Games. Team USA defeated Australia 79-55 in an effort led by Breanna Stewart with 23 points.

PHOTO: Breanna Stewart of the USA competes for the ball with Alanna Smith of Australia during the Women's Quarterfinal Basketball match during the Tokyo Olympic Games in Saitama, Japan, Aug. 4, 2021.

USA baseball sets sights on gold after 3-1 win over Dominica

The U.S. baseball team beat the Dominican Republic 3-1 to stay in the hunt for gold. Triston Casas hit his third home run of the Olympic Games and Team USA will play the loser of Japan-South Korea next on Thursday.

PHOTO: United States' Tyler Austin celebrates his home run with teammate Todd Frazier (25) in the fifth inning of a baseball game against the Dominican Republic at the 2020 Summer Olympics, Aug. 4, 2021, in Yokohama, Japan.

COVID-19 cases at Tokyo Olympics rise to 327

There were 28 newly confirmed cases of COVID-19 at the Tokyo Olympics on Wednesday, including four athletes, three of whom were staying at the Olympic Village at the time of the positive test. The total now stands at 327, according to data released by the Tokyo 2020 organizing committee.

The surrounding city of Tokyo reported 4,166 new cases on Tuesday, a seven-day average increase of 178.0%, according to data from the Tokyo metropolitan government.

PHOTO: Rows of empty seats are seen in the Olympic Stadium as the Athletics continues on day 12 of the Tokyo Olympic Games on August 4, 2021 in Tokyo, Japan.

Allyson Felix one step closer to making history

U.S. sprinter Allyson Felix finished second in her heat and advanced to the semifinals of the women’s 400m, putting her one step closer to reaching a record 10 Olympic gold medals.

If Felix wins the 400m, she would have the record for most gold medals of any female track and field athlete with 10. If she also wins the 4x400m relay, she would surpass legend Carl Lewis with the most track and field gold medals ever. The Tokyo Games are the fifth Olympics for the 35-year-old track star.

PHOTO: Allyson Felix of the United States is seen before competing in the women's 400m on Aug. 4, 2021 in Tokyo, Japan.

Japan extends domination in skateboarding events

Japan’s Sakura Yosozumi won the gold in the first ever Olympic skateboarding park event, followed by 12-year-old Kokona Hiraki, Japan’s youngest medalist.

PHOTO: Sakura Yosozumi of Japan competes in the women's park skateboarding finals at the 2020 Summer Olympics, Aug. 4, 2021, in Tokyo, Japan.

Medal-worthy hair at the Tokyo Games

PHOTO: Uche Eke, of Nigeria, competes on the horizontal bar during the men's artistic gymnastic qualifications at the 2020 Summer Olympics, July 24, 2021, in Tokyo, Japan.

PHOTO: Shelly-Ann Fraser-Pryce of Jamaica runs in the women's 200m semifinal on Aug. 2, 2021, in Tokyo, Japan.

PHOTO: Kiran Badloe, from the Netherlands, stands during competition in the windsurfing RS:X class at the 2020 Summer Olympics, July 24, 2021, in Fujisawa, Japan.

PHOTO: Naomi Osaka, of Japan, serves to Viktorija Golubic, of Switzerland, during second round of the tennis competition at the 2020 Summer Olympics, July 26, 2021, in Tokyo, Japan.

PHOTO: Gabriela Debues-Stafford of Canada competes in the women's 1500m on Aug. 2, 2021, in Tokyo, Japan.

PHOTO: Mongolian coach Undralbat Lkhagva has the Olympic rings cut and dyed into his hair as he watches the women's 10-meter air pistol at the Asaka Shooting Range in the 2020 Summer Olympics, July 25, 2021, in Tokyo, Japan.

PHOTO: Raven Saunders of the United States is seen in action in the women's shot put on Aug. 1, 2021 in Tokyo, Japan.

PHOTO: Russian Olympic Committee's Alena Tiron's braids fly as she plays in their women's rugby sevens match against New Zealand at the 2020 Summer Olympics, July 30, 2021 in Tokyo, Japan.

PHOTO: Stephanie Mawuli's hair is pictured in the 3x3 Basketball competition on day four of the Tokyo 2020 Olympic Games on July 27, 2021 in Tokyo, Japan.

PHOTO: Australia's Cameron Smith, with the letters AUS shaved into his hair, puts on his hat during round 4 of the mens golf individual stroke play during the Tokyo 2020 Olympic Games at the Kasumigaseki Country Club in Kawagoe on Aug. 1, 2021.

PHOTO: Tatjana Pinto of Germany is seen before competing in Heat 2 of the women's 100m on July 30, 2021, in Tokyo, Japan.

PHOTO: Shaunae Miller-Uibo of the Bahamas runs in the women's 400m qualifier on Aug. 3, 2021, in Tokyo, Japan.

More scenes of Olympic action:

PHOTO: Tamyra Mariama Mensah-Stock of Team United States celebrates defeating Blessing Oborududu of Team Nigeria during the Women's Freestyle 68kg Gold Medal Match on day eleven of the Tokyo 2020 Olympic Games on August 03, 2021 in Chiba, Japan.

PHOTO: Athletes compete in hurdles on Aug. 4, 2021, in Tokyo, Japan.

PHOTO: Hannah Mills and Eilidh McIntyre of Britain are seen in action with Mount Fuji in the background on Aug. 4, 2021.

PHOTO: Shauna Coxsey of Britain is seen in action during speed qualification on Aug. 4, 2021, in Tokyo, Japan.

PHOTO: China's Fan Zhendong competes against South Korea's Jang Woo-jin during their men's team semifinal table tennis match at the Tokyo Metropolitan Gymnasium during the Tokyo 2020 Olympic Games in Tokyo on Aug. 4, 2021.

PHOTO: Belgium's Thomas Van Der Plaetsen injures himself while competing in the men's decathlon long jump during the Tokyo 2020 Olympic Games at the Olympic Stadium in Tokyo on Aug. 4, 2021.

PHOTO:  Arlen Lopez Cardona of Cuba and Benjamin Whittaker of Britain react after their fight on Aug. 4, 2021, in Tokyo, Japan.

Catch up on the best moments from the previous days’ events

For more Olympics coverage, see: https://abcnews.go.com/Sports/Olympics

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