Michael Phelps won a fourth consecutive men's 200-metre individual medley on Thursday, claiming the 22nd Olympic gold of his career in Rio de Janeiro, while the women's 100m freestyle resulted in an astonishing tie.

Phelps was trailing after the first two legs but took the lead during the breaststroke and moved clear in the freestyle to win in 1 minute 54.66 seconds. He became the first swimmer to win the same event in four consecutive Games and just the third ever in any sport.

"Every single day I'm living a dream come true," Phelps said after the race. "As I kid I wanted to do something that nobody had ever done before. I'm enjoying it."

Japan's Kosuke Hagino, winner of the 400m medley came second in 1:56.61 and China's Wang Shun took the bronze. Phelps' American team-mate and old rival Ryan Lochte finished outside of the medals.

In the women's 100m freestyle, 16-year-old Canadian Penny Oleksiak and the American Simone Manuel both swam an Olympic record of 52.70 seconds to share gold ahead of Sweden's Sarah Sjostrom. In winning, Oleksiak also became the first individual gold medallist born in the 2000s.

"This is amazing, to tie for a gold," Oleksiak said. "I never thought I'd win. She deserves it as much as me."

Another American, Ryan Murphy completed the backstroke double by adding the men's 200-metres to his 100m crown, seeing off Australian world champion Mitch Larkin.

Japan's Rie Kaneto won the women's 200m breaststroke by holding off Russia's Yulia Efimova, who had previously won silver over 100m.

Phelps and Lochte were expected to duel for the medley honours, but to the delight of the crowd, it was Brazil's Thiago Pereira who led after the butterfly. Lochte edged in front after the backstroke with Pereira tieing for second with Phelps.

But in the breaststroke Phelps made the decisive move, easing away 25 metres into the lap and never looking back. He powered home in the freestyle as behind him Hagino charged into silver from fifth, while world-record-holder Lochte faded.

Phelps returned to the pool around 30 minutes later for the semi-finals of the men's 100m butterfly. He qualified fifth fastest overall with Singapore's Joseph Schooling coming first.

In between Phelps' races there was the remarkable women's 100m freestyle final which started with favourite Cate Campbell going out under world record pace. However, she faded in the second 50 metres leaving the race wide open.

Manuel moved up from third but Oleksiak charged alongside her from seventh and the pair could not be separated at the touch. Oleksiak now has a gold to go with her butterfly silver and two relay bronze from the Games while the medal is Manuel's first.

"My first gold at my first Olympics is really a surprise," Manuel said. "I'm blessed to be on the medal stand."

Sjostrom was third to complete her collection of a medal of every colour from Rio, while Bronte Campbell, Cate's sister, missed out on bronze by five hundredths.

Kaneto took the lead in the last 50 metres of the 200m breaststroke and won in 2:20.30. Efimova, a controversial figure in Rio for having twice been banned for doping, faded having made ground in the last lap.

"I'm delighted," Kaneto said. "Definitely this feels the heaviest medal of the various medals I've got. This was a lifetime ambition."

Efimova eventually finished more than a second behind, with bronze going to Shi Jinglin of China.

Murphy won in 1 minute 53.62 seconds to claim his second gold of the Rio Games. Larkin, who failed to medal in the 100m, took silver 0.34 seconds behind with bronze going to Russia's Evgeny Rylov just 1 hundredth further back.

Larkin had led after 50m but from then on Murphy dominated and never looked in danger of being caught.

"That one was very painful but I wanted it bad," Murphy said. "The 100m backstroke comes more naturally for me. "[The] 200m back is an event I really have to dig deep for. This medal means a little more to me."

In the other session semi-finals, reigning champion Florent Manaudou of France paced the 50m freestyle, while home fans cheered on Brazil's Bruno Fratus, who qualified joint sixth.

Katinka Hosszu of Hungary, chasing a fourth gold of the Games, topped the women's 200m backstroke sem-final while reigning champion Missy Franklin's miserable week continued as she missed out, placing 14th.

Latest news

Syrian opposition rules out future role for President al-Assad

The Syrian opposition said Friday it would not accept any role for President Bashar al-Assad in the future of the war-torn country, reacting to a recent US shift saying that removing al-Assad is no longer a priority for Washington.

Russian Army integrates breakaway forces of Georgian province

Parts of the small fighting forces of the Georgian breakaway province of South Ossetia have been placed under Russian military control, Russian Defence Minister Sergei Shoigu said on Friday.

Czech Republic's Pilsner Urquell beer is now Japanese

Japanese brewing company Asahi completed its takeover of the Czech brewery Pilsner Urquell on Friday, Asahi said in a statement.

Judge approves 25-million-dollar settlement of Trump University case

A US district judge on Friday approved a 25-million-dollar settlement of lawsuits and state fraud allegations against Trump University, the US president's now-defunct business venture.

Former Thai premier Thaksin to junta on reconciliation: 'Cut me out'

Former Thai prime minister Thaksin Shinawatra on Friday announced that he is not interested in the junta-led reconciliation process, three days after the junta handed him a half-a-billion-dollar tax bill for his past business deal.

Dalic: We welcome possible deal between Agrokor and banks

The government welcomes the possibility of an agreement being concluded between the Agrokor food company and creditor banks, and the bill on vitally important companies is not a fallback plan but the result of the government's care for the overall economic and financial stability of Croatia, Deputy Prime Minister and Minister of Economy Martina Dalic told a press conference in Zagreb on Friday.

Croatia, China sign action plan for cooperation in agriculture

The Croatian and Chinese ministries of agriculture on Friday signed an action plan for cooperation in the field of agriculture for the period 2017-2018, the Croatian ministry said in a statement.

ZSE indices up, Agrokor shares in focus of investor interest

The Zagreb Stock Exchange (ZSE) indices on Friday rose by more than 1.8%, with stocks of the Agrokor food and retail concern being in the focus of investor interest again.

Berlin police defend handling of Berlin market attacker

Berlin police defended themselves on Friday against accusations that they stopped surveillance on Berlin Christmas market attacker despite knowing in June 2016 he was dangerous.

Croatia, creditors tailor emergency measures to save tottering giant

Croatia's tottering retail and food giant Agrokor reached an agreement with its creditors, putting its debts standby and allowing it to continue working during emergency restructuring, the Croatian branch of Austria's Erste Bank said Friday.

Agrokor's creditors say standstill agreement to go into force today

A standstill agreement regarding the Agrokor concern's existing financial obligations to banks will take effect on Friday, additional capital will be injected into the concern in the coming days and the concern will be actively restructured, which includes a change of its management, it was said on Friday after a meeting between Agrokor's suppliers and creditor banks.

Palestinians, UN slam Israel's new settlement plan

Palestinians, Israeli activists and the UN lambasted the government of Israeli Prime Minister Benjamin Netanyahu on Friday, a day after it gave the go-ahead for the first new West Bank settlement in a quarter of a century.

South Sudan rebels release three abducted foreign oil workers

South Sudanese rebels have released three foreign engineers they abducted in early March in the oil-rich Upper Nile region, Foreign Affairs Ministry official Mawein Makol Arik said on Friday.

Turkish opposition: Imprisoned party chief has gone on hunger strike

The head of Turkey's pro-Kurdish opposition party has launched a hunger strike from prison.

European leagues threaten Champions League schedule clashes

The European Professional Football Leagues (EPFL) on Friday threatened schedule clashes on Champions League matchdays in an ongoing dispute with the governing body UEFA.

Danish court revokes citizenship of IS volunteer

A Danish appellate court on Friday stripped a man of his Danish citizenship for volunteering to fight for the extremist Islamic State in Syria.

Banks and Agrokor agree on key elements of standstill agreement

Member banks of the coordinating committee of financial creditors and representatives of the Agrokor food company have in principle agreed on key elements of a standstill agreement, which is expected to be signed later today, announcing changes in the company's management team, Erste Bank said in a statement on Friday afternoon.

Syrian man on trial in Sweden; mosque attack labelled terrorism

A Syrian man went on trial Friday in the southern Swedish city of Malmo, charged with terrorism and arson after an attack last year on a building used as an assembly hall by Shiite Muslims.