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World record holder Joshua Cheptegei of Uganda looked up to four-time Olympic medalist Kenenisa Bekele as a kid. He just stole the Ethiopian's Olympic record. Grant Fisher won bronze for the U.S.

The 24-year-old powerhouse sprinter from Texas will make her debut for Team USA at the Olympics in Paris this summer, four years after a positive drug test crashed her first attempt at the Games.

The 38-year-old tennis legend, who has been dealing with injuries in recent years, said he will step away from the sport after next month’s Davis Cup finals.

The American finished finished her gold medal run in the 400m hurdles 1.5 seconds faster than her teammate Anna Cockrell who won silver. McLaughlin-Levrone also bested her world record.

This is the second Olympics to feature surfing, but it's the first time competitors are riding waves that are a matter of "life or death," according to professional big wave surfer Garrett McNamara.

After initiation rites – including circumcision – the boys leave their families to take charge of the herds, driving them high into the mountains. It's a way of life that climate change is testing.

The United Nations effort to achieve "harmony" with the natural world kicks off in Colombia this week. Recent reports show there's a lot of work to do to achieve that goal.

The World Anti-Doping Agency has blasted America's anti-doping organization for allowing athletes to compete after using performance enhancing drugs, if they agreed to serve as informants.

The World Monuments Fund list seeks to raise awareness and funds to help preserve the sites it spotlights. Africa's Swahili Coast, Maine's lighthouses and Buddhist grottoes in China are also in peril.

For the U.S. to win its fifth straight Olympic gold medal, the men’s team has to advance out of its four-team group, and then win three consecutive games in the knockout round.