Australian swimmer Kyle Chalmers won the 100-meter freestyle gold medal in the Rio de Janeiro Olympics.
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USA's men's hockey team beat Canada's for the first time in 12 years.
Michael Phelps won the 100-meter butterfly swim in a record 50:58 at the Beijing Olympic finals.
Queen Elizabeth II of England declared the 30th Olympics opened in London, UK.
Female rowing duo Heather Stanning & Helen Glover claimed Team GB's first Olympic medal at the London Olympics.
Singapore opened the world's first Summer Youth Olympics Games.
