Christine Mboma of Namibia was second, and Gabby Thomas of the United States was third.
Shelly-Ann Fraser-Pryce, who won the silver in the 100, finished in fourth place.
Earlier in the evening, three Americans advanced through the semifinals of the men’s 200 meters — but not without some drama.
Noah Lyles, one of the favorites, slowed as he neared the finish of his heat and was passed by two runners, missing an automatic qualifying spot. He later advanced to the final based on his time. Lyles said he was going with his plan — which apparently meant conserving some energy — but acknowledged that it turned out to be “a little risky.”
The night was capped by Mondo Duplantis of Sweden, who cleared 19 feet 9 inches to win the men’s pole vault. Christopher Nilsen of the U.S. won silver in a final that was absent his American teammate Sam Kendricks, the reigning world champion. Kendricks tested positive for the coronavirus last week and was ruled out of the competition.
Duplantis, 21, grew up in Louisiana but competes for Sweden, his mother’s home country. His first Olympic gold medal assured, he tried to put on a show for the few hundred staff, media and fellow athletes who were in the stadium, but narrowly missed breaking his own world record.