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.

Beefy Kazakh swimmer Dmitriy Balandin put the former Soviet state on the Olympic map by winning his country's first gold medal in the sport.

Brazil escape a humiliating early exit from the Olympics despite another scoreless performance from Neymar as wonder kid Gabriel Barbosa strikes twice in a 4-0 win over Denmark.

Around a giant screen showing the Olympics in a central New Delhi park, young Indians chat, take selfies or snooze in the late afternoon heat, glancing only occasionally at the heroic sporting feats on display.

Brazil's Senate voted 59-21 early on Wednesday to accept charges against suspended President Dilma Rousseff and put her on trial for breaking budget laws in an impeachment process that is expected to end 13 years of leftist rule by her Workers Party.

Serena Williams' hopes of a fifth Olympic gold medal are crushed by Ukraine's Elina Svitolina as the battle for the women's title in Rio is blown wide open.

The United States and Brazil advance to the quarter-finals of the Olympic women's soccer tournament as group winners despite being held to disappointing draws in their final pool matches on Tuesday.

Shimmying amid a troupe of semi-naked samba dancers and wise-cracking with journalists, Usain Bolt is determined to bow out of the Olympics with a flourish.

Brazil face another embarrassing exit from a tournament on home soil after Neymar slumber through a second 0-0 draw of Rio 2016 against Iraq.

The 84-year-old grandmother of a Thai Olympic bronze medal winner collapses and dies while celebrating the weightlifter's success in Rio, police say.

Most of the five stars on the Chinese flags being used at medal ceremonies at the Rio Olympics are misaligned, officials say, prompting a diplomatic protest and online fury.

Brazil face another embarrassing exit from a tournament on home soil after Neymar slumber through a second 0-0 draw of Rio 2016 against Iraq.

Mercilessly cast as "greedy" and "missing" for failing to fire Brazil to victory in their Rio 2016 opener against South Africa, Neymar and his highly-touted teammates need a big response against Iraq on Sunday.

The Maracana stadium erupts in jeers as Brazil's unpopular interim president Michel Temer opens the Rio Olympics and the hostility spreads far beyond the sports venue.

A joyful sashay through Brazil's extraordinary musical heritage is infused with a social message and a warning over the dangers of climate change as Rio de Janeiro draws back the curtain of the 2016 Olympic Games with a highly charged opening ceremony.

Brazil unfurls a vast canvas celebrating its rainforest and the creative energy of its wildly diverse population in welcoming the world on Friday to the Olympic Games in Rio de Janeiro, all to the pounding beat of samba, bossa nova and funk.

Brazil and superstar Neymar are booed off as their quest for a maiden Olympic football gold medal begins with a 0-0 draw against 10-man South Africa.

Brazil's women footballers ensured the opening day of action at Rio 2016 was a happy one for the hosts with a 3-0 win over China on Wednesday.

Brazil has barely got over its World Cup disaster and now it is counting on Barcelona star Neymar to finally deliver a treasured first football Olympic gold medal.

A sharp increase in police killings has cast "a shadow of death" over Rio de Janeiro as it prepares to host the Olympic Games, Amnesty International claim in a report.