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Caster Semenya, the favorite in the women's 800 meters, is controversial. The South African runner is widely believed to be intersex, with testosterone levels much higher than other female athletes'.
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Americans Simone Biles and Aly Raisman are the first U.S. gymnasts in history to win gold and silver in the women's floor exercise at Rio's Summer Olympics.
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Cyclist Kristin Armstrong, who won Olympic gold at age 42, is one of many athletes saying that high-level sports aren't just for the young. And scientists say exercise reduces aging's toll for us all.
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The American's victory assures him of no worse than a bronze medal. Those watching the fight included boxing superstar Floyd Mayweather Jr.
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"There's no greater athlete on the planet at the moment," says Cameron Spencer, who shot Sunday's definitive photo of Olympic gold medal sprinter Usain Bolt as he won the semifinals.
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Gunfire and armed conflicts are a near-daily occurrence in some low-income neighborhoods. Residents in those favelas rely on the WhatsApp messaging service for guidance on where it's safe to travel.
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After an unexpectedly mortal performance by Simone Biles, Sanne Wevers seizes an Olympic opportunity.
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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.
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Justin Rose of Great Britain won the first Olympic gold medal in golf since 1904, after holding off Sweden's Henrik Stenson.
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Her first vault was strong; her second was near perfection. In other individual competitions Sunday, Madison Kocian won silver on uneven bars and Alex Naddour won bronze for his pommel horse routine.