American Star Watch: Annie Haeger and Briana Provancha

Michelle Obama kicks off countdown to Rio Olympics

Russian track and field athletes banned from Rio Olympics

Athletes caught doping to be banned from Rio Olympics

Best photos from Day 4 at the Rio Olympics

Reporter's Notebook in Rio: Olympics - for one or for many?

Rio Guide: The feeling of having golf back in the Olympics

Five things to watch for Thursday at the Rio Olympics

Five things to watch for Saturday at the Rio Olympics

Five things to watch for Monday at the Rio Olympics

Best photos from Day 5 at the Rio Olympics

Five things to watch for Wednesday at the Rio Olympics

Rio favela celebrates Olympics with mixed emotions

5 things to watch for Saturday at the Rio Olympics

Best photos from Day 14 at Rio Olympics

From war to Rio: Road to Olympics for two African refugees

Security concern for 2018 Winter Olympics

Clemson football's uplifting Special Olympics experience

USA Basketball names 30 finalists for Olympics

Kim Jong 'Um' wows at the Winter Olympics

Lindsey Vonn on new perspective she had at these Olympics

World Cup: Four hungry teams enter semifinals

France, Belgium move on to World Cup semifinals

Top takeaways from first half of MLB season

Fitness model attempting 50 Ironmans in 50 days

Joey Chestnut and Miki Sudo win 2018 Nathan’s Famous Hot Dog Eating Contest

Quarterfinal matches filled with teams looking to make history