Kuwait has hailed the two medals won by its athletes who are competing at the Rio Games as independents, following a row between the Gulf state and world sporting bodies.

Joao Havelange, who has died at 100, was the man who made FIFA a global powerhouse, only to resign under a cloud of corruption that has darkened the world footballing body's reputation.

His death was confirmed Tuesday by the Samaritano Hospital in Rio de Janeiro. He had been treated there as recently as July for pneumonia.

Usain Bolt stormed to an unprecedented third straight Olympic 100m title as Wayde van Niekerk smashed Michael Johnson's long-standing 400m record in Rio on Sunday.

On a night of high drama Sunday, Bolt galloped past drug-tainted U.S. rival Justin Gatlin to cross in 9.81sec and become the first athlete to win the 100m three times in a row.

Fencer Ibtihaj Muhammad came to the Rio Games determined to show the world that Muslim-American women could compete in elite sports.

And the 30-year-old from New Jersey, the first US Olympian to wear a hijab -- a headscarf worn by Muslim women -- during competition, came away with a bronze medal on Saturday in the women's team sabre event.

Neymar led Brazil into the semi-finals of the Olympics with his first goal of the competition to edge the third of a trilogy of grudge matches with Colombia in three years 2-0.

The Barcelona star curled home an inch-perfect free-kick after just 12 minutes of Saturday's game, but was lucky to escape with a yellow card for chopping down Andres Roa and provoking a brawl between the two teams just before half-time.

Michael Phelps is said to have surpassed the deeds of Leonidas of Rhodes at the ancient Olympics and the American's coach believes we will never see his likes again.

"Absolutely not, I'm not even looking," Bob Bowman said after Saturday's final swimming races which left Phelps with 23 Olympic gold medals.

A classic Michael Phelps performance ended the swimming legend's career with 23 Olympic gold medals before handing over the Rio Games center stage to Usain Bolt.

The 29-year-old Jamaican track star lines up for the men's 100m final Sunday night and says arch-rival Justin Gatlin, the fastest man this year, 'holds no fear for me' ahead of one of the biggest showdowns of the Games.

Russia's Olympic team has complained to Rio organizers after flags hanging in its Olympic village accommodation were allegedly desecrated.

Spain tipped off in an eerily empty arena due to a bomb scare but the 2012 silver medallists finally showed up on the court for an all-important first Olympic basketball win on Thursday.

After last-second losses in their first two games, Spain got past Nigeria 96-87 in a match-up of desperate winless teams, led by 16 points from veteran centre Pau Gasol.

Michael Phelps won a 22nd Olympic gold but doping reared its ugly head again Friday as Chinese swimmer Chen Xinyi and Bulgarian athlete Silvia Danekova became the first major cases of the Rio Games.

Chen's failed test after narrowly missing a bronze medal in the women's 100-metre butterfly was announced as athletics headed into the Olympic spotlight needing an antidote to its own doping scandals.