Greg Myre

America's Kerri Walsh Jennings lost her first beach volleyball match in four Olympics, as she and her partner fell to Brazil. Simone Biles wrapped up her sparkling Rio games with a fourth gold.

Brothers Gary and Paul O'Donovan took silver in rowing, Ireland's first ever medal in the sport. But they set a new Olympic standard for the best post-competition interview.

The Jamaican seized the title of "world's fastest man" for an unprecedented third time. In the men's 400, South African Wayde van Niekerk was not only a surprise winner — he set a world record.

Lochte's taxi was stopped by robbers who put a cocked gun to his head. "I was like 'whatever.' He took our money, he took my wallet," the swimmer told NBC. No one was hurt.

There are 205 countries competing in Rio, many for decades, and most of them can't match Phelps' total of 23 golds.

Michael Phelps captured one last gold, his 23rd in his staggering career. On the track, Jamaica kept its stranglehold on the women's 100 meters as Elaine Thompson became the world's fastest woman.

Solo earned the wrath of Brazilians before she arrived for the Olympics. She didn't help her cause by calling Sweden's team 'cowards' after they knocked the Americans out of the tournament.

Thursday's theme was American stars battling each other. Biles topped Aly Raisman as they went 1-2 in the women's all-around. Michael Phelps easily defeated Ryan Lochte in their showdown in the pool.

Kohei Uchimura, who has been the best in the world for seven years, kept his Olympic title in the all-around. American Kristin Armstrong took a third gold in cycling — a day before turning 43.

At 31, Michael Phelps became the oldest swimmer to win an individual event. Katie Ledecky won her second race in Rio. And Simone Biles led the U.S. gymnastics team to a win of historic proportions.

Ledecky won her first gold in Rio and is expected to take home more. Phelps added to his Olympic record, winning his 19th gold in the 4x100 relay. Here are Sunday's highlights.

Russia's para-athletes were caught up in the same scandal as the country's Olympic team. "The anti-doping system in Russia is broken," says the head of the International Paralympic Committee.

The International Paralympic Committee will announce its decision Sunday. Some media reports say that the entire Russian squad is likely to be barred.

Thrasher, 19, topped a field of 50 in the 10-meter air rifle competition on Saturday, winning the first of more than 300 medals that will be awarded at the Summer Olympics.

They are a concise lesson in world history, reflecting wars won and lost, economic growth and decline and a country's overall standing in the world.

American women are poised to win far more medals than any other women's squad in Rio. As part of their relentless rise, they're also expected to outpace the U.S. men.

Russians have been banned in a host of sports at the Summer Games, with track and field, rowing and weightlifting hit the hardest.

Foreign policy is usually a campaign afterthought. But the next president will inherent a raft of global challenges, from ISIS to trade deals to a pivot to Asia.

You can't follow everything in Rio, but you want to catch the highlights. Here's a guide to the American athletes and events likely to produce the most memorable performances.

The Paralympic Committee said it's investigating 35 "disappearing positive samples" among disabled Russian athletes. The committee plans to announce by Aug. 1 whether it will ban Russia.