RIO DE JANEIRO (AP) — The Latest on the 2016 Summer Olympics in Rio de Janeiro (all times local):
The women's 10-kilometer open water swimming competition is underway at Fort Copacabana.
Under sunny skies and a slight breeze, 26 women waded into the Atlantic Ocean and started the race about 250 yards off-shore. The starting platform wasn't used after it broke into three pieces during bad weather last week.
Beachgoers strolled the sands of famed Copacabana Beach, some oblivious to the Olympics going on around them. Others stood ankle deep in the waves washing ashore.
It's just the second time an Olympic open water competition is being held in open ocean waters. The other was at the first Olympics in 1896 in Athens.
Four years ago in London, open water was held in the Serpentine in Hyde Park. At the 2008 Beijing Games, it was held in the rowing and canoe canal.
The International Paralympic Committee says Brazilian athlete Luciano Dos Santos Pereira will miss his home Paralympics after receiving a four-year doping ban.
The IPC says the steroids stanozolol and oxandrolone were found in a urine sample provided by the Brazilian in May. The four-year ban runs until June 2020.
The Paralympics are taking place after the Olympics, from Sept. 7 to 18 in Rio de Janeiro.
It's one happy day in Britain as the country celebrates the five gold medals it won Sunday at the Rio Olympics.
British athletes have won 15 golds at the games so far, putting their nation ahead of China in total medals and second only to the Americans on the medal table in Rio.
Gymnast Max Whitlock scored a historic double gold win — the first time a British athlete has claimed an Olympic gold for gymnastics. He graced the fronts of most of the nation's newspapers, with one dubbing him "Mighty Max."
Tennis star Andy Murray took his second gold in consecutive games — the first player to win two golds in singles.
Track cyclist Jason Kenny beat teammate Callum Skinner in the men's sprint while Justin Rose won the first Olympic golf competition since 1904.
Day 10 of the Rio Games features athletes competing for 17 gold medals.
On the track, world champion Allyson Felix of the United States will be going for her fifth career Olympic gold medal in the women's 400-meter final. Medals are also up for grabs in men's pole vault and men's 800 meters.
Simone Biles, the Olympic all-around champion, is seeking her fourth gold medal in Rio, this time on the balance beam.
Swimmers in the women's Olympic marathon will test Rio's dirty waters, tackling a 10-kilometer (6.2-mile) course off Copacabana Beach.
The heavyweights battle in boxing and wrestling. Russian world champion boxer Evgeny Tishchenko faces Kazakhstan's Vassilliy Levit, while Cuban wrestler Mijian Lopez takes on Turkey's Riza Kayaalp.
At the Rio velodrome, Mark Cavendish of Britain tries to capture the Olympic medal that has long eluded him in the omnium. Lasse Norman Hansen of Denmark leads the six-event contest at the midway point.
It only took 17 years — and 43.03 seconds.
Exploding out of the blocks Sunday, Wayde van Niekerk of South Africa broke Michael Johnson's 17-year-old world record in the 400 meters in Rio de Janeiro, leaving two of the greatest one-lap runners of this era in his dust.
Van Niekerk finished 0.15 seconds faster than Johnson ran in 1999, setting a mark considered one of the almost untouchable records in track.
"I thought someone was going to catch me," van Niekerk explained. "I felt very alone at the end."
The 24-year-old van Niekerk even leaned at the finish line, which he really didn't need to do as Kirani James of Grenada and LaShawn Merritt of the Unites States weren't even in the picture. James, the defending Olympic champion, finished with the silver and Merritt, who won gold in Beijing, hung on for bronze.
The world track and field body has accepted a ruling by the Court of Arbitration for Sport and says Russian long jumper Darya Klishina will be competing at the Rio Olympics.
Klishina was the only one of 68 Russians cleared to participate in Rio by the IAAF, the sport's governing body. It tried to ban her from the Olympics last week, however, after receiving what it said was new information from World Anti-Doping Agency investigator Richard McLaren. Klishina had appealed that ban.
The IAAF says "we instigated a review process following new evidence presented to us. The outcome we reached to revoke Darya Klishina's exceptional eligibility was not upheld by CAS despite the information received from McLaren and she is therefore eligible to compete in Rio."
The court said Klishina can take part in Tuesday's qualifying because she has been based outside of Russia for three years and been subjected to regular drug testing.
How many gold medals can one gymnast collect at one Olympics?
Simone Biles is trying to find out.
The 19-year-old American will try to make it 4 for 4 as she seeks another gold Monday on the balance beam in Rio de Janeiro.
Biles already has three golds from the team final, the all-around and the vault, which she won on Sunday — the most golds by an American female gymnast during one Olympics.
The world champion on the beam, Biles posted the highest qualifying score in Rio. Her biggest challenge will likely come from teammate Laurie Hernandez, who edged Biles during the U.S. Olympic Trials last month.
The men will compete for individual medals in vault and still rings.
The real test of Rio's dirty water — or maybe Olympic athletes' immune systems — is about to begin.
The women's 10-kilometer marathon swim is taking place Monday just off of Copacabana Beach and most of the elite swimmers will take about two hours to complete the 6.2-mile course.
Open water swimming is always difficult, but Rio de Janeiro's heavily polluted water is upping the ante this year.
A 16-month long independent analysis by The Associated Press has shown the water venues used by 1,400 athletes at the Rio Olympics are teeming with dangerous viruses from human sewage that could cause athletes to become ill.
Rio, a metropolitan area of 12 million, treats only about half of its sewage, dumping the rest into nearby waters.
It wasn't pretty. It involved heavy humidity, see-sawing momentum and 102 unforced errors from both players.
But in the end, Britain's Andy Murray became the first tennis player in Olympic history with two singles gold medals, winning his second in a row by wearing down Juan Martin del Potro of Argentina 7-5, 4-6, 6-2, 7-5 in a 4-hour final Sunday night.
"Anything could have happened," said Murray, who took the last four games after trailing 5-3 in the fourth set. "Emotionally, it was tough. Physically, it was hard ... so many ups and downs."
Murray's terrific returns, impenetrable defense and track-down-every-ball coverage countered the 6-foot-6 del Potro's booming serves and furious forehands. No man ever has defeated the top three seeds on the way to a gold, but del Potro sure came close before winding up with a silver.
Earlier Sunday, Kei Nishikori won bronze, Japan's first Olympic tennis medal since 1920.
You knew he could do it, he knew he could do it.
And he did it.
Usain Bolt sauntered onto the track Sunday night and waved his hands, signaling for more applause even before the race in Rio de Janeiro began.
The Jamaican sprinter's swan song in the Olympic 100 meters was a pedestrian-by-his-standards 9.81-second sprint, capped off by pointing to his chest a step before the finish line.
"It was brilliant," Bolt said. "I didn't go so fast but I'm so happy I won. I told you guys I was going to do it."
Bolt won his record-setting third straight title and his seventh Olympic gold, beating American Justin Gatlin, who was greeted with raucous boos, by .08 seconds. Andre de Grasse of Canada took the bronze.
Bolt has a chance for two more golds in Rio: in his favorite race, Thursday's 200 meter final, and then in the 4x100 relay Saturday night.
The lone Russian track and field athlete at the Olympics has won her appeal to compete at the Rio de Janeiro Games.
The Court of Arbitration for Sport ruled early Monday morning that long jumper Darya Klishina is eligible to take part in Tuesday's qualifying.
Klishina was the only one of 68 Russians cleared to participate in Rio by the IAAF, largely because she has been based outside Russia for the past three years. But the sport's governing body banned her from the Olympics last week after receiving what it said was new information.
CAS ruled that Klishina was eligible to compete because she fulfilled the requirements set by the IAAF.
The long jump final is scheduled for Wednesday.
AP Summer Games website: http://summergames.ap.org