11:05 p.m.
Beslan Mudranov is Russia's first medalist of the Rio Olympics after beating Kazakhstan's Yeldos Smetov in a judo final between representatives of two countries recently buffeted by doping scandals.
Mudranov took gold in the men's 60-kilogram division, beating Smetov on a golden score.
Russia is competing with a team diminished by doping scandals and bans, particularly in track and weightlifting.
Neighboring Kazakhstan faces losing five weightlifting gold medals from the 2008 and 2012 Olympics after its champions' drug test samples were retested and found to contain steroids.
Japan's Naohisa Takato and Uzbekistan's Diyorbek Urozboev took the bronze medals in the 60kg division.
11 p.m.
The first judo gold medal of the Olympic games went to Argentina's Paula Pareto, a former bronze medalist from the Beijing Games and now a qualified doctor.
The third-ranked Pareto jumped repeatedly in victory when she defeated South Korea's Bokyeong Jeong in the women's 48-kilogram division, much to the delight of a crowd packed with Argentinians waving their national flag. Pareto climbed into the crowds afterward to be enveloped not only by giddy fans, but numerous flags.
After hugging one particularly patriotic fan whose face was painted in blue and white, Pareto was left with faint traces of blue paint on the right side of her face.
The two bronze medals went to Japan's Ami Kondo and Kazakhstan's Otgontsetseg Galbadrakh.
10:25 p.m.
Hoang Xuan Vihn's first gold medal also was Vietnam's first Olympic gold medal ever.
Hoang rallied to beat hometown favorite Felipe Almeida Wu on the final shot of men's 10-meter air pistol. Vietnam had previously won two medals, both silver, in previous Olympic games.
Wu trailed by as many as 2.3 points, but moved 0.2 ahead of Hoang with a 10.2 on his penultimate shot. The Brazilian hit 10.1 on his final shot, setting off a raucous chant of "Wu!" from the crowd, but Hoang shot 10.7 to earn gold.
Hoang raised his arms in triumph following the final shot and the Brazilian fans sent Wu off with another chant.
8:55 p.m.
The first upset is in on Day 1 of the women's Olympic volleyball tournament.
Upstart Netherlands, back in the Olympics for the first time in 20 years since Atlanta in 1996, defeated medal favorite and third-ranked China in five sets Saturday, 25-23, 21-25, 18-25, 25-22, 15-13 at Maracanazinho arena.
"This was really unbelievable, incredible," Netherlands outside hitter Celeste Plak said.
Next up for the Netherlands will be another tough pool-play opponent for the Dutch: A matchup with the top-ranked American women on Monday.
The Dutch know their challenge to get out of pool play.
"We want to make something extraordinary not something ordinary," said fist-pumping Netherlands coach Giovanni Guidetti.
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8:40 p.m.
Adam Peaty of Britain has lowered his world record in the 100-meter breaststroke preliminaries at the Rio Olympics.
He qualified first in 57.55 seconds Saturday, lowering his old mark of 57.92 set in London on April 17, 2015.
Peaty and 15 other swimmers moved on to the evening semifinals.
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8.20pm
Defending Olympic champion Ye Shiwen of China has failed to qualify for the final of the women's 400-meter individual medley.
Ye finished 27th among 33 swimmers in Saturday's preliminaries with a time of 4 minutes, 45.86 seconds.
Ye nearly lost her world record, too.
Katinka Hosszu of Hungary was under world-record pace for much of the race and missed taking down Ye's mark by just 15-hundreths of a second. Ye set the record of 4:28.43 four years ago at the London Olympics.
Hosszu, nicknamed "The Iron Lady" because she swims so many events, was the fastest qualifier in 4:28.58.
Also advancing to the late-night final were Mireia Belmonte Garcia of Spain in second, American Maya DiRado in third and Hannah Miley of Britain in fourth. Elizabeth Beisel of the U.S. was sixth-fastest to get into the eight-woman final.
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8:10 p.m.
There was a scare at the Olympic Equestrian Center as a military bullet pierced the roof of the media tent and landed on the floor.
The incident occurred during the lunch break at the dressage event Saturday. The competition was not disrupted and nobody was hurt.
The bullet landed inches from one of the media tables at the end of the room where the press conferences are held, leaving a clear hole in the roof. An official statement is expected shortly.
The arena is located near a military compound.
The incident was immediately reported and the bullet collected, while Brazilian military was swiftly at the scene.
7:45 p.m.
Swimmer Yusra Mardini of the refugee team competing under the Olympic flag at the Rio Games won her preliminary heat in the 100-meter butterfly.
However, that result wasn't fast enough to advance Mardini to the semifinals on Saturday. Her time of 1 minute, 9.21 seconds was 41st overall.
The top 16 swimmers moved on to the late-night semifinals. By comparison, Sarah Sjostrom of Sweden had the top qualifying time of 56.26 seconds.
Mardini was a competitive swimmer in Syria until she left Damascus with her sister a year ago and settled in Berlin.
7.10pm
A bomb squad is investigating after an apparent blast shook the area near the finish line of the men's cycling road race.
Reporters could hear a loud boom on the press tribune and felt the ground shake as the cyclists had about 70 kilometers to go Saturday.
An officer assigned to the event said it was a controlled explosion of an unattended bag. He did not give his name because he was not authorized to speak.
A half dozen military police were cordoning off the area. No one was immediately evacuated, and it did not appear that anyone was injured. The race was continuing and had not been rerouted.
There is heavy security all over the city amid concerns about safety as the Olympics begin.
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6:50 p.m.
The fallout from the Russian doping scandal is causing havoc at the Olympic Aquatics Stadium.
The start list was altered at the last minute to add a Russian swimmer.
In the women's 100-meter butterfly, Natalia Lovtcova wasn't listed on the initial list that came out.
But she's now set to compete in the last of six preliminary heats along with fellow Russian Svetlana Chimrova.
Three other Russian swimmers were initially banned from the Rio Games because of their links to doping. But it appears they have been cleared to compete.
Yulia Efimova, Vladimir Morozov and Nikita Lobintsev are all listed as competitors on the Russian team.
Efimova posted on social media that she'd been cleared, while Morozov held a news conference Friday to say he would be swimming in Rio.
6:30 p.m.
Katie Ledecky will have a shot at five medals at the Rio Olympics.
Despite finishing seventh in the 100-meter freestyle at the U.S. trials, Ledecky will anchor the women's 4x100-meter freestyle relay on Saturday at the Olympic Aquatics Stadium.
Amanda Weir will swim the leadoff leg, followed by Lia Neal, Allison Schmitt and Ledecky.
The 19-year-old Ledecky is already set to swim the 200, 400 and 800 free in Rio, as well as anchor the 4x200 free relay.
Abbey Weitzeil and Simone Manuel were the top finishers in the 100 free at the U.S. trials. They are resting up for the evening final, where they will likely be joined the two fastest swimmers in the prelims.
Dana Vollmer, who finished sixth at trials, also is a possibility. But she's busy enough as it is, competing Saturday in the 100 butterfly.
6:15 p.m.
A 16-year-old American who was the youngest male ever to qualify for table tennis in Olympic history has lost in the first round of the games.
Kanak Jha was beaten Saturday by Iranian Noshad Alamiyan 4-1 in the best of seven match.
Jha struggled with nerves in the first game, losing it decisively to Alamiyan, 24, but he bounced back to win the second. Jha couldn't build momentum after that, losing three straight games. After hitting long on match point, Jha flipped his racket into the air and caught it.
He'll be back for the team event.
Jha said after the match that he was nervous and struggled to handle the Iranian's attacking style.
His teammate, Lily Zhang, fared better.
The Californian demolished Venezuela's Gremlis Arvelo 4-0, a huge improvement on Zhang's Olympic debut four years ago in London, when she lost as a 16-year-old in the first round. The 20-year-old Californian plays again later Saturday.
Zhang's coach, Massimo Constantini, says she controlled her nerves much better than she did in London. When asked about her preparations for the next game, he said she was taking a nap.
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6:10 p.m.
World champion Japan is off to a bit of a shaky start in men's gymnastics.
While the Japanese managed to post the top score during their subdivision in team qualifying on Saturday morning, they were uncharacteristically sloppy. Six-time world champion and defending Olympic gold medalist Kohei Uchimura fell off high bar, and world floor exercise champion Kenzo Shirai stepped out of bounds during his routine.
Uchimura recovered to lead the all-around after the first of three subdivisions with a score of 90.498.
Host Brazil seemed to feed off the energy of the home crowd. The Brazilians were second behind Japan with a team score of 268.078. Veteran Brazilian gymnast Diego Hypolito broke down in tears after posting a 15.5 on floor exercise while a sea of Brazilian flags waved from the stands.
The top eight teams advance to Monday's team final. The top 24 all-around finishers will move on to next Wednesday's individual final.
6.05p.m.
Moroccan boxer Hassan Saada is officially out of the Olympics.
He was arrested Friday on allegations he sexually assaulted two Brazilian housekeepers in the Olympic Village. Police said the possible attacks happened Wednesday. Under Brazilian law, suspects can be held for a long period while a case is examined.
With Saada out, Turkey's Mehmet Nadir Una was declared a walkover winner and advanced to the round of 16 in the light heavyweight division.
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5:40 p.m.
Rio de Janeiro Games organizers have apologized to the spectators enduring long lines to access the Olympic Park on the first full day of competition.
Organizing committee spokesman Mario Andrada acknowledged that "we obviously need to upgrade" the systems and have asked authorities to speed up bag checks.
Andrada said Saturday that "we apologize to everyone who is standing in the sun in lines outside the venues ... we need to fix this in the next couple of hours."
Addressing questions about official buses getting lost, Andrada said organizers would check if drivers had sufficient training.
But Andrada says "we don't have major structural problems with transport."
5:35 p.m.
Score one from the Pros vs. the Joes in Olympic boxing.
Italian fighter Carmine Tommasone became the first professional fighter to win an Olympic bout after 112 years of amateur competition.
Tommasone is one of three traditional pros who will compete for gold medals. He's joined by Cameroon's Hassan N'Dam and Thailand's Amnat Ruenroeng.
The International Boxing Association's high-profile plan to entice prominent pros to Rio de Janeiro didn't work. The stars didn't come out to try and add some gold, silver or bronze to the green they make fighting professionally.
Tommasone defeated Mexican boxer Lindolfo Delgado via a three-round unanimous decision in a lightweight bout.
Tommasone fought roughly 14 pounds over his pro weight after qualifying in a special tournament reserved for professionals.
5:20 p.m.
France's Marie-Florence Candassamy has pulled off a stunning upset in fencing, knocking top-ranked Anqi Xu of China out of the women's epee tournament in the round of 32.
Candassamy entered the tournament ranked just 49th in the world, but her aggressive fighting style had Xu on her heels. Candassamy took a 10-6 lead after the second period and clinched the blowout victory midway through the third period.
Russia's Tatiana Logunova, ranked third in the world, also saw her tournament end with an early round defeat. And all three Americans; Katharine Holmes and sisters Courtney and Kelley Hurley, were knocked out before the round of 16.
4:40 p.m.
The Olympic boxing tournament is underway featuring the first men's bouts without headgear since 1980 in Moscow.
Britain's Galal Yafai dominated Cameroon's Simplice Fotsala in a unanimous decision victory to open the action.
"It was good to go down in history as the first bout without headguards, but it was just another fight for me," Yafai said.
It's also the first time scoring will use the traditional 10-point system. There is a boxing event every day of the Olympics.
Olympic boxing fans still hooted for the ring card girls. But the women were dressed in conservative white shorts and T-shirts, not the scantily clad attire generally seen at major professional boxing events.
4:30 p.m.
No instances of mechanical doping were discovered during checks by the UCI prior to the start of the men's Olympic road race along the famed Copacabana Beach.
Officials from cycling's governing body checked each frame for hidden motors using a tablet and software that can detect magnetic fields given off by them. Mechanical doping became a hot-button issue earlier this year when a motor was found in the frame of a cyclocross rider.
Meanwhile, a sizeable break is working well together early in the men's race, where a cobblestone section sent Ahmet Orken of Turkey to the deck and bounced the chain of Australia's Richie Porte off.
Meanwhile, Dutch rider Tom Dumoulin has already abandoned. He broke his wrist at the Tour de France a couple weeks ago but started anyway. He is among the favorites in the time trial next week, so it's no surprise that he has chosen to save himself.
4:25 a.m.
France won the first game of rugby at the Olympics in 92 years - and the first ever for the women - beating Spain 24-7 to kick off the six-day sevens tournament.
Patricia Garcia got the tournament underway at the Summer Games, kicing off for Spain, and Camille Grassineau crossed for the first try to give France the lead after 2 minutes and 24 seconds.
Rugby sevens, the fast-pace, condensed form of the game, is the chosen format for the sport's return to the Olympic program for the first time since 1924, when the U.S. men won the gold medal in the 15-a-side tournament.
There were about 1,000 people in the crowd for the opening match at the temporary 15,000-seat Deodoro Stadium.
The U.S. women open against Fiji later Saturday, with Jillion Potter selected in the starting seven, capping an inspirational comeback from cancer that sidelined her for the 2014-15 world series competition.
Australia and New Zealand are the favorites for the women's gold medal, which will be decided Monday. Fiji and New Zealand are favorites for gold in the men's competition, which kicks off Tuesday.
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4:25 pm.
Serbia's men's pair capsized on the Rodrigo de Freitas Lagoon as choppy waters complicated things for rowers on the first day of competition.
Milos Vasic and Nenad Benik ended up in the water as their boat overturned about halfway through their heat, which was easily won by New Zealand's Eric Murray and Hamish Bond.
After a quiet morning the wind picked up and athletes were struggling to keep their oars from bouncing off the waves on the 2-kilometer course.
Britain's Alan Campbell, who won his heat in the men's single sculls, said the conditions took him by surprise.
"He needs to spread his arms a bit more to protect us," Campbell said, nodding toward the iconic Christ the Redeemer statue towering over the rowing venue.
4:20 pm
Host nation Brazil is off to a flying start in women's handball after stunning reigning Olympic and world champion Norway 31-28 in the opening game of the tournament.
Ana Paula Rodrigues led the way with 12 goals for Brazil, which was 2013 world champion but has never won an Olympic handball medal.
Brazil took the lead early in the first half at the Future Arena and held off a Norwegian revival which briefly leveled the score in the second at 18-18.
As the arena filled up with passionate home fans for the early morning game, five unanswered goals and some big saves from goalkeeper Mayssa Raquel Pessoa took Brazil's lead from 22-21 to 27-21, paving the way for victory.
4.15pm
American shooter Virginia Thrasher has won the first gold medal of the Rio Olympics in the women's 10-meter air rifle.
Thrasher shot 10.5 on her first shot of the final elimination round and smiled after 10.4 on her second shot put her comfortably ahead of China's Li Du. Thrasher had a cumulative score of 208.0 to beat Du, a two-time gold medalist, by a point. China's Siling Yu earned the bronze.
The 19-year Thrasher became the first freshman to win both individual NCAA rifle titles and helped West Virginia win the team title. She followed that by winning the U.S. Olympic Trials less than a month later, earning a trip to Rio.
American Sarah Scherer made the finals in her return to the Olympics after two back surgeries, but was eliminated in the first round. She finished eighth.
4pm.
Eyewitnesses say a man was shot dead near the Maracana Stadium in Rio de Janeiro after Friday's Olympic opening ceremony.
Associated Press photographers reported hearing loud multiple gun shots, forcing games volunteers and others leaving the ceremony to duck for cover behind cars.
A shooter was seen running from the scene and fleeing in a car close to a university parking lot.
After police and medics arrived on the scene, paramedics were seen treating the victim as blood poured from his body onto the road.
3:45 p.m.
Defending Olympic champion Gabby Douglas will get her shot at history. Douglas is one of three American women who will compete in the all-around for the U.S. during women's gymnastics preliminaries on Sunday.
Three-time world champion Simone Biles and three-time Olympic medalist Aly Raisman will also do all four events for the Americans, who are heavily favored to defend the gold they won easily in London four years ago. The top eight teams in qualifying move on to Tuesday's team final. The top 24 individual qualifiers will also advance to next week's all-around final, with a limit of two per country, meaning either Biles, Douglas or Raisman will not make the cut.
Douglas is attempting to become the first woman in nearly 50 years to repeat as Olympic champion. She is the first reigning Olympic champion to return to the next games since Nadia Comaneci in 1980, where she finished second.
Laurie Hernandez, who finished second to Biles at Olympic trials, will compete on floor exercise, vault and balance beam. Madison Kocian will compete on uneven bars, where she is the world champion.
3:30 p.m.
Beach volleyball is underway at Copacabana Beach and Italy's Adrian Carambula started it off with a Skyball.
Instead of a hard and sinking serve preferred by most beach players, Carambula sends a high, spinning missile into the air. The trick serve is often difficult to return — especially if it's windy or the sun is in the opponent's eyes.
Carambula's first attempt was short of the net. His next seemed long but the Austrians played it. The venue DJ joined in the fun by playing the James Bond theme "Skyfall."
Carambula then launched a half-dozen more before mixing in some more typical serves.
The match between the Italian and Austrian men on Saturday was the first in the Olympic beach volleyball tournament.
2:50 p.m.
Du Li of China leads qualifying after setting an Olympic record in the women's 10-meter air rifle.
Li, a two-time gold medalist, had a cumulative score of 420.7 and an average 10.518 to lead heading into Saturday's finals.
Germany's Barbara Engleder was second and Iran's Elaheh Amadi was second. Americans Sarah Scherer and Ginny Thrasher both made the finals.
2.30pm
Competition is underway on the first full of the Olympic Games, with table tennis, rowing, archery, cycling, water polo and fencing all taking place under a cloudless Rio de Janeiro sky and warm temperatures.
Traffic in parts of Rio quickly ground to a standstill as a cycling road race forced downtown roads to be closed. The race, including the world's top riders, started on Rio's famous Copacanbana beach and was due to be held over around six hours on Rio's roads and up steep hills into the mountains behind the city. Thousands of police and soldiers were patrolling the city.
Temperatures in Rio are forecast to vary between 22 and 31 degrees Celsius (72 and 88 degrees Fahrenheit) on Saturday.
Preliminary soccer games have already been played and more are due to be played on Saturday, along with rugby sevens, gymnastics, judo and swimming. Many of the events take place in the Olympic Park on Barra de Tijuca, a modern suburb to the west of Rio.
1pm
Pope Francis has written a letter of encouragement to the first team of refugees to participate in the Olympic Games.
Francis wished each of the 10 athletes success, saying he hoped that "your courage and strength find expression through the Olympic Games and serve as a cry for peace and solidarity." The letter, written in Spanish and dated July 26, was released by the Vatican on Saturday.
The pope said he had researched each of their lives through interviews and news reports. He said he was offering his prayers and signed the letter "In brotherhood, Francis."
The team of six men and four women is completing under the Olympic flag.
11:30 a.m.
The fireworks are over, the samba on temporary hold — and now it's time for Olympic athletes to take center stage in Rio de Janeiro.
Dozens of competitions are being held Saturday in over 20 Olympic sports, ranging from archery to basketball, cycling, gymnastics, rowing, soccer, swimming and volleyball, among others. Twelve gold medals will be awarded.
On Friday, Brazil laced its high-energy opening party for the games of the 31st Olympiad with a sobering message of the dangers of global warming. Graphic projections of world cities being swamped by rising seas set Rio de Janeiro's otherwise fun and festive gala apart from other Olympic openers.
But nowhere parties quite like Rio. Supermodel Gisele Bundchen shimmered to the tune of "The Girl from Ipanema." Fireworks formed the word "Rio" in the skies. The city's colossal Christ the Redeemer statue was bathed in Brazilian yellow and green. Dancers, all hips and wobble, grooved to thumping funk and sultry samba.
11:15 a.m.
The Olympic women's basketball teams from Turkey and France want to shift the conversation away from attacks and back to national pride.
Both nations have faced difficult times after being hit with deadly extremist attacks, and Turkey is struggling with the aftermath of a bloody attempted coup. For players on both teams, being at the Summer Olympics in Rio offers a respite from what's happening at home — and a chance to show the world a united front.
The teams play each other in their Olympic tournament opener Saturday.
French center Isabelle Yacoubou says "in France, we started to lose faith in people ... I hope these Olympics will show people how we can come back together."
Yacoubou adds "it's kind of special that we face each other first."
11 a.m.
For U.S. soccer goalie Hope Solo, the firsts just keep on coming.
On Saturday, barring anything unusual, Solo will appear in her 200th game for the U.S. women's national team in a group stage match against France at the Rio Olympics. She'll be the first goalkeeper in history to reach the milestone in international play — no small feat.
It also will make her the 11th U.S. player — across all positions — to reach that number of caps.
The 200th cap is just the latest notable statistic for Solo in a long, illustrious and always interesting career.
Last month, Solo became the first goalkeeper with 100 international shutouts when the United States defeated South Africa 1-0 in Chicago. It was also her 150th career win. Earlier this week, 16-year national team veteran got her 101st shutout when the United States defeated New Zealand 2-0 in the team's Olympic opener in Belo Horizonte.