WATCH: Tokyo Olympic Games: Day 6 key moments
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 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.
Sunisa Lee wins gold
Sunisa Lee won the gold medal after a tremendous performance in the individual all-around competition. Lee’s teammate Simone Biles cheered her on from the stands as Lee delivered a strong floor exercise routine to seal the win.
Biles withdrew from the competition Wednesday so she could "focus on her mental health," USA Gymnastics said in a statement Wednesday. Biles' replacement in the competition, Jade Carey, finished in 8th place.
MORE: Sunisa Lee wins gold in gymnastics all-around in Tokyo Olympics
Jamie Squire/Getty Images
Sunisa Lee of Team United States reacts after competing on uneven bars during the Women's All-Around Final on day six of the Tokyo 2020 Olympic Games at Ariake Gymnastics Centre on July 29, 2021 in Tokyo, Japan.
Lindsey Wasson/Reuters
Jordan Chiles, Simone Biles and Mykayla Skinner of the United States react during the medal ceremony were teammate Sunisa Lee won the gold on July 29, 2021 in Tokyo.
Caeleb Dressel wins gold in 100m freestyle, sets Olympic record
U.S. swimmer Caeleb Dressel won his first individual gold medal after a record-setting time of 47.02 seconds in the 100m freestyle. Fellow swimmer Robert Finke took home the gold in the 800m freestyle event, increasing Team USA's gold medal count to 13.
MORE: Caeleb Dressel Isn’t Just The Next Michael Phelps. He Might Be Even Better
Al Bello/Getty Images
Caeleb Dressel of Team United States reacts after winning the gold medal in the Men's 100m Freestyle Final on day six of the Tokyo 2020 Olympic Games at Tokyo Aquatics Centre on July 29, 2021 in Tokyo, Japan.
Jonathan Nackstrand/AFP via Getty Images
Robert Finke competes in the final of the men's 800m freestyle swimming event during the Tokyo 2020 Olympic Games at the Tokyo Aquatics Centre in Tokyo on July 29, 2021.
COVID-19 cases at Tokyo Olympics rise to 198, Tokyo sees record number of cases
There were 24 newly confirmed cases of COVID-19 among people at the Tokyo Olympics on Thursday, including U.S. pole vaulter Sam Kendricks and two other athletes staying in the Olympic village. The total now stands at 198, according to data released by the Tokyo 2020 organizing committee.
The surrounding city of Tokyo reported a record high of 3,865 new cases on Thursday, a seven-day average increase of 161.9%, according to data released by the Tokyo metropolitan government.
MORE: Tokyo Olympics: Australian track and field team resumes normal activities after COVID-19 scare
Yuichi Yamazaki/Getty Images
People wearing face masks cross a street on July 29, 2021 in Tokyo, Japan.
Charlie Riedel/AP Photo
In this June 21, 2021, file photo, Sam Kendricks competes during the finals of the men's pole vault at the U.S. Olympic Track and Field Trials in Eugene, Ore.
Heat continues to be a factor, tennis matches moved to later afternoon
The heat index hit 99 degrees on Wednesday, causing athletes, including the world's second-ranked tennis player, Daniil Medvedev, to seek medical attention. The matches were moved from 11 a.m. to 3 p.m. local time to avoid the hottest part of the day, the International Tennis Federation announced in a statement.
Edgard Garrido/Reuters
The olympic rings are seen in the semifinal match between Ivan Dodig of Croatia and Marin Cilic of Croatia against Marcus Daniell of New Zealand and Michael Venus of New Zealand on July 29, 2021.
Hiroto Sekiguchi/AP Photo
Daniil Medvedev of ROC (Russian Olympic Committee) gets medical treatment during men's singles third round against Fabio Fognini of Italy at Ariake Tennis Park in Tokyo on July 28, 2021.
Djokovic 2 matches away from Golden Slam
Serbia’s Novak Djokovic, the top ranked tennis player in the world, is two matches away from achieving a Golden Slam after defeating Japan’s Kei Nishikori 6-2, 6-0. A player would have to win all four major events and the Olympics in a calendar year, a triumph only ever attained by Germany's Steffi Graf.
MORE: What is a Golden Slam? Novak Djokovic looks to make men's tennis history with Olympics
Clive Brunskill/Getty Images
Novak Djokovic of Team Serbia celebrates victory after his Men's Singles Quarterfinal match against Kei Nishikori of Team Japan on day six of the Tokyo 2020 Olympic Games at Ariake Tennis Park on July 29, 2021 in Tokyo, Japan.
20 athletes banned from Olympics before Friday's track and field opening
Athletes from Belarus, Bahrain, Ethiopia, Kenya, Morocco and Nigeria were barred from competing after they did not meet the anti-doping requirements by the Athletics Integrity Unit, according to The Associated Press. The athletes were part of the track and field competitions, which begin Friday.
Michael Steele/Getty Images
Pole vault world record holder Armand Duplantis of Sweden gets the feel of the track ahead of competition in athletics at the National Stadium ahead of competition at the Tokyo Olympic Games on July 29, 2021 in Tokyo, Japan.
More scenes from today's action:
Diego Azubel/EPA-EFE/Shutterstock
Sera Azuma, center left, of Japan in action against Kiefer Lee of USA as Nora Mohamed, left, of Egypt faces Larisa Korobeynikova of Russian Olympic Committee (ROC) in the Women's Foil team quarterfinals, in Chiba, Japan, July 29, 2021.
Ezra Shaw/Getty Images
Cyclists go over a jump at the Women's BMX quarterfinal on day six of the Tokyo 2020 Olympic Games at Ariake Urban Sports Park on July 29, 2021 in Tokyo, Japan.
Eugene Hoshiko/AP Photo
A man walks past papers displaying Japanese gold medalists at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan.
Thomas Coex/AFP via Getty Images
Spain's Cristina Ouvina runs with the ball past Serbia's Tina Krajisnik and Sonja Vasic in the women's preliminary match between Spain and Serbia during the Tokyo 2020 Olympic Games at the Saitama Super Arena in Saitama on July 29, 2021.
Peter Parks/AFP via Getty Images
Competitors take part in the women's windsurfer race during the Tokyo 2020 Olympic Games sailing competition at the Enoshima Yacht Harbour in Fujisawa, Kanagawa Prefecture, Japan, on July 29, 2021.
Jamie Squire/Getty Images
Sunisa Lee of Team United States competes on uneven bars during the Women's All-Around Final on day six of the Tokyo 2020 Olympic Games at Ariake Gymnastics Centre on July 29, 2021 in Tokyo, Japan.
Stephen Maturen/Getty Images
Shyenne Lee celebrates after her sister Sunisa Lee, of Team United States won gold in the Women's All-Around Final on day six of the Tokyo 2020 Olympic Games at a watch party on July 29, 2021 in Oakdale, Minnesota.
David Ramos/Getty Images
Ito Mima of Team Japan serves the ball during her Women's Singles Bronze Medal match on day six of the Tokyo 2020 Olympic Games at Tokyo Metropolitan Gymnasium on July 29, 2021 in Tokyo, Japan.
Petros Giannakouris/AP Photo
Sarah Sponcil, right, of the United States, dives for the ball as teammate Kelly Claes looks on during a women's beach volleyball match against Kenya at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo, Japan.
Hassan Ammar/AP Photo
Flora Pasztor, of Hungary, cries after her team lost against Canada Foil team in the women's individual Foil classifications 5-8 competition at the 2020 Summer Olympics, Thursday, July 29, 2021, in Chiba, Japan.
Catch up on the best moments from the previous days' events
MORE: Key moments from the Olympic Games: Day 5
MORE: Key moments from the Olympic Games: Day 4
MORE: Key moments from the Olympic Games: Day 3
MORE: Tokyo Olympics opening ceremony: Best moments from the event
MORE: Key moments from the Olympic Games before the opening ceremony
SLIDESHOW: Tokyo Olympics Opening Ceremony
For more Olympics coverage, see: https://abcnews.go.com/Sports/Olympics