RIO DE JANEIRO — The Latest from the 2016 Summer Olympics at Rio de Janeiro (all times local):
No rest for the weary in Olympic tennis: A day after getting trapped in an elevator for 40 minutes — and only 15
The 2009 U.S. Open champion is facing Portugal's Joao Sousa in a second-round singles match Monday.
It's in the same stadium where the oft-injured del Potro shed tears after beating Djokovic in a pair of tiebreakers late Sunday night.
And later Monday, del Potro has more work to do. He'll be playing a doubles match, too.
Katinka Hosszu is competing in her third swimming event in as many days at the Rio Olympics.
The Hungarian nicknamed "The Iron Lady" for her ambitious schedule topped the preliminary heats of the 200-meter individual medley on Monday. Her time of 2 minutes, 7.45 seconds led 15 other women into the semifinals later at night.
Hosszu opened the eight-day swimming competition by winning the 400 individual medley in a world-record time. On Day 2, she advanced in the 100 backstroke with the second-fastest time in the semifinals.
She will be busy Monday night, competing in the 100 back final at 10:30 p.m. and returning 66 minutes later for the 200 IM semifinals.
Michael Phelps has begun his first individual event of the Rio Olympics in the 200-meter butterfly.
The 19-time gold
Phelps finished fifth in the heats on Monday, with a time of 1 minute, 55.73 seconds. He easily advanced to the semifinals at night, unlike teammate Tom Shields, who was 20th. Only the top 16 moved on.
Phelps drew the loudest cheers at the pool, with fans standing up to take photos of him when he appeared at the starting blocks.
A pair of Hungarians had the top two times. Tamas Kenderesi was fastest in 1:54.73 and Laszlo Cseh was second in 1:55.14.
Chad le Clos of South Africa was third in 1:55.57.
Brazilian fans were excited to see their two swimmers — Leonardo de Deus and Kaio Marcio — advance to the semifinals.
Brittney Griner used her size advantage inside scoring eight of the first 10 points for the United States, and the Americans turned in another perfunctory rout in beating Spain 103-63 on Monday.
The Americans, who are 2-0, came up short of another record-setting performance like they had in their group play opener. But they were still impressive.
Spain, the silver
With the 6-foot-8 Griner scoring quickly and easily near the bucket, the Americans finished the first quarter on a 23-6 run.
Diana Taurasi led the United States with 13 points, and Alba Torrens had 20 for Spain.
The biggest win may have come in the second half. Fans finally sustained some "USA" chants without being drowned out by others inside the arena.
Swimmer Katie Ledecky's bid to sweep the longer freestyle events at the Rio Games is on track.
A night after winning the 400-meter free in world-record time, Ledecky has posted the top qualifying time in the 200 free preliminaries.
The American teenager won her four-lap heat in 1 minute, 55.01 seconds on Monday.
Emma McKeon of Australia was second quickest in 1:55.80.
Missy Franklin, the female swim star of the 2012 London Games, advanced to the late-night semifinals in 12th place with a time of 1:57.12. It was Franklin's first race in the pool on the third day of swimming.
Also advancing was Italian star Federica Pellegrini.
Olympics organizers are urging competitors to cut the trash talk.
American swimmer Lilly King raised the
It came after Efimova waved a No. 1 finger after her semifinal in the 100-meter breaststroke.
Efimova is being allowed to compete in Rio after a 16-month suspension was placed on hold while world anti-doping officials conduct further studies on the drug.
International Olympic Committee spokesman Mark Adams says "people should be free to compete in tranquility and not be addressed by others. We would encourage people to respect their fellow competitors."
A smattering of boos greeted Efimova after she won her preliminary heat.
At an IOC briefing, Adams said: "Brazilian fans seem to be pretty egalitarian. They seem to boo athletes from many countries. It's quite difficult to work out why they might be booing one athlete and not another."
The Olympic sailing regatta is underway on Guanabara Bay, which made headlines in the months preceding the Olympics because of water fouled by raw sewage and trash.
Men's and women's windsurfers are sailing off Flamengo Beach while the men's Lasers and women's Laser Radials are off Niteroi, on the other side of the bay from downtown Rio. Sugarloaf Mountain forms an imposing backdrop. Christ the Redeemer is hidden by fog.
Robert Scheidt, 43, is trying to become the first Olympic sailor and first Brazilian to win six Olympic medals. He owns two golds, two silvers and a bronze.
An independent study by The Associated Press has shown high levels of viruses and sometimes bacte:1ria from human sewage in the bay.
Italy's Niccolo Campriani has earned gold in men's 10-meter air rifle at the Rio Olympics after taking silver in London four years ago.
Campriani, who also won gold in 3-position rifle in London, had 206.1 points to finish 1.5 ahead of silver
Russia's Vladimir Maslennikov just missed the final match, ending up 0.2 points behind Kulish. His bronze made Russia the 13th nation to have 400 overall Olympic medals.
Campriani took advantage after two of the world's top shooters failed to make it out of qualifying.
World No. 1 Cao Yifei of China had a poor final shot of qualifying to miss the final eight by one spot. Romania's Alin George Moldoveanu was nearly three points behind the lowest qualifying score and finished 19th.
Brazil may finally win a judo medal on Monday after two days of disappointing fights by its much-acclaimed martial arts team at the Rio Olympics.
Former judo world champion Rafaela Silva has advanced to the semifinals after winning her three fights in the morning, including a hard-fought victory over the second-seeded South Korean, Jandi Kim.
Silva won her first fight in just 46 seconds after throwing German Miryam Roper twice for an automatic ippon victory. In her quarter-final match, she was pitted against Hungary's Hedwig Karakas. With just over two minutes left in the bout, Silva managed to throw Karakas and scored enough to win.
If Silva wins her semifinal, she will guarantee Brazil at least a silver medal in the final. If not, she will have the chance to fight for a bronze in the repechage competition later on Monday.
UPSET ALERT: Talk about a tournament changer. Top seed and world record holding archer Kim Woojin of South Korea has been beaten by a player ranked 29th in the world.
Indonesia archer Riau Ega Agatha beat Kim 6-2 in the round of 16 during the men's event at the Rio de Janeiro Olympics. Kim was a heavy
Both Kim and Ega Agatha seemed stunned after the match, with Kim quietly answering questions from reporters and at times gazing off as Ega Agatha was all but at a loss for words.
Two of Russia's top track and field athletes have failed in a bid to have their ban from the Olympics put on hold by a Swiss court.
Sergei Shubenkov, the world 110-meter hurdles champion, tells Russian media he and two-time Olympic pole vault gold
Shubenkov tells Russia's state Tass news agency that this refusal "is just the first step" and that it "doesn't in any way stop us from further actions," but doesn't say what he might do next.
Russia was banned from international track and field, including the Olympics, in November over widespread doping.
The United States claimed its second straight win against a top-three team in women's field hockey, beating No. 3 Australia 2-1 on Monday.
Michelle Vittese and Caitlin van Sickle scored for the Americans, who defeated No. 2 Argentina 2-1 in their Olympic opener on Saturday.
United States goalie Jackie Briggs had six saves and had four saves on the four penalty corners she faced. The crowd chanted, "Jackie! Jackie!" after the match.
The fifth-ranked Americans, who lead Pool B with six points, moved closer to qualifying for the quarterfinals. The top four teams in each six-team pool advance.
The Americans dealt a major blow to Australia. The Hockeyroos dropped their opener to Britain 2-1 on Saturday and now have no points with three pool play matches remaining.
Kenya has two wins in the first three days of the Olympic boxing tournament.
Peter Mungai won his light flyweight bout and celebrated by dancing in the ring. African nations are often outclassed in boxing because the traditional infrastructure isn't there to groom young fighters.
Mungai said he learned to fight with his bare hands before he could find a pair of boxing gloves.
"When I found some gloves, it was amazing," he said, smiling. "With bare hands, it was like an assault. It was just like a fight, not a sport."
Rayton Okwiri won a bout for Kenya over the weekend and Benson Gicharu, the third member of the team, fights later Monday.
The 35-year-old Mungai, only 5-foot-5, defeated 21-year-old Chinese fighter LV Bin and beamed as his trainers danced on the ring apron in jubilation.
"I just wanted to be a winner," Mungai said. "Now, I'm a winner."
Robert Wangila was the last Kenyan to win Olympic gold in 1988 in Seoul, Korea
AP Summer Games