The Latest: Balancing act: Simone Biles seeks 4th Rio gold

RIO DE JANEIRO (AP) — The Latest on the 2016 Summer Olympics in Rio de Janeiro (all times local):

5:30 a.m.

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.

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5 a.m.

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.

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4:25 a.m.

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.

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3:40 a.m.

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 4×100 relay Saturday night.

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2:10 a.m.

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.

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AP Summer Games website: http://summergames.ap.org