Key moments from the Olympic Games: Day 4

Here's what you missed from Day 4 of the 2020 Summer Olympics in Tokyo.

Simone Biles withdraws from women's gymnastics team final, U.S. wins silver

After a rare stumble on her first vault, American gymnastics star Simone Biles withdrew from the team competition, leaving Team USA's Suni Lee, Jordan Chiles and Grace McCallum to finish the event. Biles, considered the greatest gymnast in history, said after the competition that she wasn’t injured but wasn’t in the right headspace to continue.

“Today has been really stressful,” Biles said at a press conference. “After the performance that I did (on vault), I thought it was better if I took a step back and let these girls go out there and do the job, and they did just that.”

Alaskan swimmer Lydia Jacoby wins gold, U.S. takes lead in medal count

American swimmer Lydia Jacoby won the gold medal in the women's 100-meter breaststroke. Jacoby, 17, is the first athlete from Alaska to make the U.S. Olympic swim team. Her teammate Lilly King, who was favored to win, took home the bronze.

Team USA now leads the Tokyo Olympics with 22 medals, including nine gold.

Team USA's Carissa Moore takes the gold in surfing

Team USA's Carissa Moore won the first-ever Olympic gold medal for women's surfing. The surfing finals were moved up a day to take advantage of an incoming tropical storm.

It's the first time that surfing has been included on the Olympic schedule for the Summer Games.

Tropical Storm Nepartak to make landfall in latest challenge for Olympics

Other sports were less enthusiastic about the approaching storm as rainy conditions descended over Japan. Olympic officials have rescheduled archery and rowing events as Tropical Storm Nepartak, which was downgraded from a typhoon, is forecast to make landfall north of Tokyo on Tuesday.

COVID-19 cases at Tokyo Olympics climb to 160

There were seven newly confirmed cases of COVID-19 among people at the Tokyo Olympics on Tuesday, including two athletes and two personnel who were staying at the Olympic village. The total now stands at 160, according to data released by the Tokyo 2020 organizing committee.

The surrounding city of Tokyo reported 2,848 new cases on Tuesday, according to data released by the Tokyo metropolitan government.

Osaka exits early in emotional loss

Japanese tennis superstar Naomi Osaka lost to Marketa Vondrousova of the Czech Republic 6-1, 6-4 in the women's tennis singles and with it, her chances to bring home the gold for Japan.

An outpouring of support followed Osaka's exit, coming just days after she lit the Olympic cauldron at the opening ceremony.

U.S. women’s basketball wins 50th consecutive Olympic game

The U.S. women’s basketball team defeated Nigeria 81-72 in their opening game to achieve the milestone of 50 consecutive Olympic wins. Players A’ja Wilson, Brittney Griner and Sue Bird, one of Team USA's flag bearers at the Olympic opening ceremony last week, led the team to victory.

Japan defeats U.S. softball team again in gold medal match

Veteran pitchers Cat Osterman and Monica Abbott must have been struck by déjà vu as the U.S. softball team fell to Japan 2-0 in the gold medal game. This rematch of the 2008 gold medal game — which was the last year softball was included in the Olympics — ended similarly with a 2-1 loss to Japan. Osterman and Abbott were the only returning members of that 2008 team and again could not hold off Japan from again taking the gold.

After winning first-ever gold for Philippines, Hidilyn Diaz receives more awards

Hidilyn Diaz brought home the Philippines’ first gold medal ever Monday in the women’s 55kg weightlifting competition. Along with the medal, Diaz was awarded $660,000 in cash and a new house from the Philippines government and several businessmen, according to Bloomberg.

More scenes from today's action:

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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