Dalilah Muhammad powers to a brilliant victory in the women's 400m hurdles to become the first winner of the event from the United States in Olympic history.

Brazilian cyclist Kleber Ramos and Chinese swimmer Chen Xinyi are disqualified from the Olympic Games for having failed doping tests, the Court of Arbitration for Sport (CAS) says.

US Olympic authorities apologize to Brazil on Thursday as two US swimmers are allowed to go home having retracted a fabricated story about being mugged in Rio.

The United States grasp a second chance to reach the Olympic women's 4x100 metres final with both hands on Thursday, racing alone around the Rio track in 41.77 seconds to knock China out of the last eight.

Reports emerge that the US Olympic swimmers claiming to have been mugged in Rio in fact got into a fight with an armed gas station security guard.

Kristi Castlin dedicates her 100m hurdles medal to victims of gun violence after helping the United States claim a historic podium sweep in the event.

Brazilian police arrest two US swimmers and a top International Olympic Committee official as scandal overshadows the Rio Games.

Usain Bolt will race the 200m final on Thursday after comfortably winning his semi-final, but there is no place for American rival Justin Gatlin as he fails to qualify.

A Brazilian judge orders that US Olympic swimmer Ryan Lochte and teammate James Feigen be prevented from leaving Brazil.

Jamaica unleashes a new sprint sensation as Omar McLeod takes the Rio Olympics 110m hurdles on Tuesday.

Cao Yuan shakes off the pressure of being the only Chinese diver left in the field -- a rarity in Olympic finals -- to deliver China's fifth diving gold medal.

Reigning champion Christian Taylor retains his Olympic triple jump title on Tuesday.

Michael Phelps has acknowledged a "small part" in his own dramatic Olympic defeat by Singapore hero Joseph Schooling but bears no grudge.

Everything stood still. Even the lottery draw in Jamaica was delayed, but Usain Bolt hit the jackpot last night, continuing his dominance in the sprints.

Jeff Henderson of the United States wins gold in the men's long jump on Saturday, leaping 8.38 metres to snatch the title in the last round.

The battle to be crowned world's fastest man takes centre stage at the Rio Olympics on Sunday with Usain Bolt facing another showdown with Justin Gatlin where the image of athletics will be on the line.

With crimson lipstick, eye-liner, mascara and a beaming smile, Michelle Carter wins a stunning Olympic shot put gold to sprinkle a little glitz on an event often cruelly ridiculed for the shape of its women athletes.

In just one performance, Singapore's Joseph Schooling beats swimming great Michael Phelps, takes home his city state's first Olympic gold medal and becomes an instant millionaire.

US sensation Simone Biles adds the Olympic women's all-around to her team title for a second gymnastics gold title in Rio on Thursday.

Australia's new teenage swimming sensation Kyle Chalmers wins the blue riband Olympic 100m freestyle gold, as golf heads for a controversial return to the Games after 112 years.