Here's what you missed from Day 5 of the 2020 Summer Olympics in Tokyo.

July 28, 2021, 2:01 PM

• 18 min read

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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.

Simone Biles withdraws from individual all-around

American gymnastics superstar Simone Biles has decided not to compete in Thursday's final individual all-around competition at the Tokyo Olympics so that she can "focus on her mental health," USA Gymnastics said in a statement Wednesday.

"Simone will continue to be evaluated daily to determine whether or not to participate in next week’s individual event finals," the sport's national governing body added. "We wholeheartedly support Simone’s decision and applaud her bravery in prioritizing her well-being. Her courage shows, yet again, why she is a role model for so many."

Jade Carey, who had the ninth-highest score in qualifications, will compete in Biles' place in the all-around, according to USA Gymnastics. The decision follows Biles' early exit from the team final on Tuesday.

Simone Biles of Team United States is embraced by coach Cecile Landi during the Women's Team Final on day four of the Tokyo 2020 Olympic Games at Ariake Gymnastics Centre on July 27, 2021 in Tokyo, Japan.

Katie Ledecky takes gold in 1st-ever women’s 1500 freestyle

Only an hour after she failed to place in the 200-meter freestyle, Team USA's swimming star Katie Ledecky was back in the pool racing for gold and Olympic history.

Ledecky easily beat her competition, winning by more than four seconds in the 30 lap-race and becoming the first woman to win a gold medal in a 1,500-meter freestyle. Her teammate Erica Sullivan won silver.

Katie Ledecky of Team United States celebrates after winning the gold medal in the Women's 1500m Freestyle Final on day five of the Tokyo 2020 Olympic Games at Tokyo Aquatics Centre on July 28, 2021 in Tokyo, Japan.

Katie Ledecky is seen swimming in the women's 1500m freestly event on July 28, 2021, in Tokyo.

Athletes grapple with heat and humidity as Tropical Storm Nepartak makes landfall

The suffocating heat wave in Tokyo was so unbearable during the men's tennis singles final that Russian player Daniil Medvedev reportedly told the umpire: "I can finish the match, but I can die ... If I die, are you going to be responsible?"

Temperatures in the Olympic host city were at around 88 degrees Fahrenheit, but the humidity from recent rain showers moved the heat index up to 99.

Tropical Storm Nepartak ultimately spared the Games and made landfall on Wednesday morning in Japan's Miyagi prefecture, some 250 miles north of Tokyo.

Daniil Medvedev, of the Russian Olympic Committee, pauses during a third round men's tennis match against Fabio Fognini, of Italy, at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan.

Paula Badosa, of Spain, is helped off the court in a wheelchair after retiring due to illness during the quarterfinals of the tennis competition at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Tokyo, Japan.

COVID-19 cases at Tokyo Olympics rise to 174

There were 14 newly confirmed cases of COVID-19 among people at the Tokyo Olympics on Wednesday, including contractors, media members and Games-concerned personnel. The total now stands at 174, according to data released by the Tokyo 2020 organizing committee.

The surrounding city of Tokyo reported 3,177 new cases on Wednesday, a 7-day average increase of 153%, according to data released by the Tokyo metropolitan government.

The city skyline is seen from the Tokyo Skytree on July 28, 2021 in Tokyo, Japan.

U.S. men's basketball team bounces back from 1st round loss to defeat Iran

After losing their first game since 2004 on Sunday to France, the U.S. men's basketball team easily beat Iran 120-66. Players Damian Lillard and Devin Booker helped lead Team USA to victory with 21 and 16 points, respectively.

Team USA has one more game in the group round on Saturday against Czech Republic.

United States' Jayson Tatum drives to the basket ahead of Iran's Navid Rezaeifar during a men's basketball preliminary round game at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Saitama, Japan.

Javale McGee of Team United States blocks a shot by Navid Rezaeifar of Team Iran during a Men's Preliminary Round Group A game on day five of the Tokyo 2020 Olympic Games at Saitama Super Arena on July 28, 2021 in Saitama, Japan.

Novak Djokovic keeps Golden Slam dream alive

Serbian tennis player Novak Djokovic defeated Spain's Alejandro Davidovich Fokina 6-3, 6-1 in the third round match of the men's singles.

Djokovic is now three games away from achieving a Golden Slam, which is when a tennis player wins all four Grand Slam tournaments as well as a gold medal at the Summer Olympics in a single calendar year. Steffi Graf of Germany is the only player to accomplish such a feat.

Serbia's Novak Djokovic serves to Spain's Alejandro Davidovich Fokina during their Tokyo 2020 Olympic Games men's singles third round tennis match at the Ariake Tennis Park in Tokyo on July 28, 2021.

U.S. women’s 3x3 basketball wins gold in inaugural year

The U.S. women’s team beat Team ROC 18-15 to win the first-ever gold medal in women’s 3x3 basketball. The U.S. team only lost one game throughout the entire tournament, and the win increases Team USA’s gold medal count to 11.

United States' Allisha Gray heads to the basket past Evgeniia Frolkina of the Russian Olympic Committee during a women's 3x3 gold medal basketball game at the 2020 Summer Olympics, July 28, 2021, in Tokyo, Japan.

Jacquelyn Young, Stefanie Dolson, Kelsey Plum, and Allisha Gray of Team United States celebrate victory and winning the gold medal in the 3x3 Basketball competition on day five of the Tokyo 2020 Olympic Games at Aomi Urban Sports Park on July 28, 2021 in Tokyo, Japan.

More scenes from today's action:

Natalya Diehm of Team Australia rides during a training session for the Cycling BMX Freestyle at Ariake Urban Sports Park ahead of the Tokyo Olympic Games on July 28, 2021 in Tokyo, Japan.

Jennifer Mucino-Fernandez of Team United States competes in the archery Women's Individual 1/32 Eliminations on day five of the Tokyo 2020 Olympic Games at Yumenoshima Park Archery Field on July 28, 2021 in Tokyo, Japan.

Hungary's Andras Szatmari, left, competes against USA's Daryl Homer in the men's sabre team quarter-final bout during the Tokyo 2020 Olympic Games at the Makuhari Messe Hall in Chiba, Japan, on July 28, 2021.

Jang Seong Min of South Korea is seen in action with Jose Coyikal Seru of Japan and Kameli Soejima of Japan on July 28, 2021 in Tokyo.

Nguyen Thuy Linh of Team Vietnam competes against Sabrina Jaquet of Team Switzerland during a women's singles group match on July 28, 2021 in Chofu, Tokyo, Japan.

Tao Geoghegan Hart of Britain competes during the men's cycling individual time trial at the 2020 Summer Olympics, Wednesday, July 28, 2021, in Oyama, Japan.

Daiki Hashimoto of Japan won the gold medal in men's individual all-around on July 28, 2021 in Tokyo.