Here’s what happened Tuesday in Tokyo.

TOKYO — Simone Biles unexpectedly pulled out of the women’s team gymnastics competition after losing her bearings in the air mid-vault. Amid the shake-up, a stronger Russian squad beat the Americans to the gold medal; the United States was second.

The U.S. met Japan in the last Olympic softball final, in 2008, and Japan won. Softball was then dropped from the Games, and on its return the same two teams met. Japan won again, 2-0.

The U.S. women’s basketball team began its Olympics with a closer-than-expected win over Nigeria, 81-72. A’ja Wilson led all scorers with 19 points.

The American Lydia Jacoby won gold in the women’s 100-meter breaststroke, while her more heralded teammate Lilly King finished third. Tom Dean and Duncan Scott went one-two for Britain in the 200 freestyle.

Naomi Osaka lit the cauldron at the opening ceremony, but was eliminated in the third round of the tennis tournament, 6-1, 6-4, by Marketa Vondrousova of the Czech Republic.

The American men’s rugby team took a 21-7 halftime lead against Britain in the quarterfinals but couldn’t hang on and lost, 26-21.

Carissa Moore of the United States and Italo Ferreira of Brazil won the first Olympic surfing gold medals.

Flora Duffy won the first gold medal ever for Bermuda, in the women’s triathlon.

The U.S. women’s soccer team, which lost to Sweden and beat New Zealand, split the difference and drew against Australia. The team advanced to the quarterfinals.

The United States had won the most medals through Tuesday, with 25, although Japan had won the most gold meals, 10.