Oleksandr Usyk of the Ukraine, in red, defends against Clemente Russo of Italy, in blue, during the heavyweight boxing final. Usyk won gold on a 14-11 points decision on Day 15 of the London 2012 Olympic Games on Saturday, August 11. Check out the best images from Day 14 of competition on Friday, August 10. The Games ran through Sunday, August 12.
London (CNN) -- Jamaica's Usain Bolt and Yohan Blake led their team to gold and a new world record in the men's 4x100-meter relay final Saturday night, bringing a thrilling end to competition at the London Olympic Stadium.
The four-man Jamaican team finished in 36.84, with Bolt drawing cheers as he ran the electrifying last leg.
"For me, it's just a wonderful feeling to end on a high note," he told the BBC with a big smile. "I knew it was possible, I wish we could have gone faster, but I guess it leaves room for improvement."
It was the third gold medal of the London Games for Bolt, who already made history at these Olympics by winning back-to-back 100-meter and 200-meter titles.
The U.S. team, which included Justin Gatlin and Tyson Gay, came in second with 37.04, matching the previous world record and setting a new national record.
Trinidad & Tobago took the bronze, but only after the Canadian team was disqualified because captain Jared Connaughton stepped out of his lane. Athletics Canada unsuccessfully appealed.
Connaughton later tweeted, "I'm so sorry everyone. My heart is broken. I let my team down. I'm sorry." But head coach Alex Gardiner said an apology wasn't necessary, because Connaughton had given it all he had.
"I feel nothing but overwhelming sadness for these guys. DQ is a hard pill to swallow," Gardiner said, according to Athletics Canada.
Leading up to the men's relay final were three other exciting races.
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The United States took home the gold in the women's 4x400-meter relay, following its world-record win in the women's 4x100-meter race Friday.
The team of DeeDee Trotter, Allyson Felix, Francena McCorory, and Sanya Richards-Ross finished nearly four seconds ahead of the Russians. Jamaica won the bronze.
Great Britain's Mo Farah gave the home crowd something to cheer about when he won the men's 5,000-meter race earlier in the evening.
Farah is the 5,000-meter world champion and has now doubled his medal haul from the Games, following his win in the 10,000-meter race a week ago. Ethiopia's Dejen Gebremeskel took silver and Kenya's Thomas Pkemei Longosiwa took bronze in the 5,000-meter.
Also Saturday, South Africa's Caster Semenya, the athlete at the center of a gender row three years ago, won the silver in the women's 800-meter final. She was a favorite going into the race along with Russia's Mariya Savinova, who won the gold; fellow Russian Ekaterina Poistogova won the bronze.
With 32 gold medals up for grabs across 15 sports, it was a busy day outside the stadium, too.
The U.S. women's basketball team won its fifth straight Olympic gold medal when it beat France 86-50 in the North Greenwich Arena along the Thames.
Team USA advanced to the final after beating Australia, winner of the bronze.
The first medal for Team USA on Saturday came in the women's mountain bike competition at Hadleigh Farm in Essex, with a bronze for Georgia Gould of Baltimore. Gold went to France's Julie Bresset and silver to Sabine Spitz from Germany. The venue, which made its Olympic debut Saturday, hosts the men's mountain bike event Sunday.
Brazil beat the United States 3-1 in the women's volleyball final in four sets, setting the gold and silver medals, after Japan took the bronze.
The host of the next summer Games in Rio de Janeiro in 2016 and a famously soccer-mad nation, Brazil had hoped for its first Olympic football gold in the men's final at Wembley but instead saw Mexico claim a convincing 2-1 victory.
The Brazilians got off to an inauspicious start when they conceded a goal by Mexico's Oribe Peralta in the first minute of the game. Peralta headed the ball in for a crucial second goal with 75 minutes gone.
Brazil came back with a goal in the 90th minute but failed to capitalize on a chance in the final seconds, giving gold to Mexico. Korea took the bronze.
A gold for Russia came in the men's 50-kilometer race walk, which set off on The Mall by Buckingham Palace on Saturday morning.
Just over three-and-a-half hours later, Sergey Kirdyapkin crossed the line first to take gold, ahead of Australian Jared Tallent, who took silver in Beijing, and China's Tianfeng Si.
The field was without Beijing gold-medalist Alex Schwazer, who was expelled from the Games on Friday after testing positive for a banned substance, recombinant erythropoietin (rhEPO), which aids red blood cell production. The 27-year-old Italian had set an Olympic record four years ago, but it was beaten by Kirdyapkin on Saturday.
Another athlete, Syrian hurdler Ghfran Almouhamad, was disqualified from the Games on Saturday, the International Olympic Committee said.
Almouhamad, who went out in the heats of the women's 400-meter hurdles, tested positive for the banned substance methylhexaneamine, a stimulant.
Over at the Aquatics Center, Team USA celebrated by jumping into the pool after David Boudia won the gold in the 10-meter platform. China's 19-year-old Qiu Bo, who had entered the final as the favorite, appeared disappointed with his silver while Britain's Tom Daley jumped for joy to win a bronze in front of a home crowd.
Team GB's first gold medal of the day came on the sparkling waters of Eton Dorney Lake, when Ed McKeever won the men's K1 200-meter canoe sprint.
The gold was the 26th for the host nation, which is in third in the medal table, behind the United States and China and ahead of Russia.
Ukraine picked up gold in the men's C1 200-meter canoe sprint, thanks to the paddle power of Yuri Cheban, and silver in the women's canoe spring kayak single K1 200-meter. Lisa Carrington of New Zealand took gold in that event.
Russia's pair stormed through the field to claim victory in the men's K2 200-meter race, the last canoe sprint event and final contest at Eton Dorney, with silver going to Belarus and bronze to Great Britain.
Meanwhile, defending champion Evgeniya Kanaeva claimed gold for Russia in individual all-around rhythmic gymnastics, the final individual gymnastics contest of the Games.
Fellow Russian Daria Dmitrieva took silver and Liubou Charkashyna of Belarus took bronze.
Once the athletics competitions wrap up in the stadium Saturday night, the race will be on for technical crews to transform it for the closing ceremony.
London Games organizers say musical performances will be the focus of the closing ceremony, titled "A Symphony of British Music."
Among the British acts rumored to be taking part are the Spice Girls and the Pet Shop Boys, as well as singers Jessie J. and George Michael and rapper Tinie Tempah.
And like the spectacular opening ceremony just over two weeks ago, which was characterized by a quirky exuberance, the closing will feature thousands of local volunteers and schoolchildren.
The show, attended by many of the 10,500 athletes who competed at the Games, will likely be watched on television by around 750 million people worldwide, the London organizing committee says.
A CNN/ORC poll released Saturday showed that two-thirds of Americans think the London Games have been very successful. Nearly a quarter said they enjoyed watching the Games more than on previous occasions.
The survey of 1,010 Americans was carried out Tuesday and Wednesday.
CNN's Alexander Felton contributed to this report.
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Edwige Lawson-Wade No.8 of France goes up for a shot against Sue Bird No.6 of United States in the second half during the Women's Basketball Gold Medal game.
Race walkers compete in front of Buckingham Palace during the Women's 20 km Walk final.
David Boudia of the United States competes in the Men's 10m Platform Diving Final.
Montenegro's Bojana Popovic, top, shoots over Norway's pivot Heidi Loke, left, during the women's gold medal handball match between Norway and Montenegro.
Gold medalist Luke Campbell of Great Britain celebrates with the British national flag during the awards ceremony for the Bantamweight (56kg) boxing category.
Carlo Molfetta of Italy celebrates winning the Men's +80kg Gold Medal fight against Anthony Obame of Gabon.
DeeDee Trotter of United States looks on after competing during the Women's 4 x 400m Relay Final.
Vitezslav Vesely of Czech Republic competes during the Men's Javelin Throw final.
Aleksandr Usyk of Ukraine celebrates his gold medal victory over Clemente Russo of Italy in the Heavyweight (91kg) boxing final.
Tom Daley of Great Britain celebrates with his teammates after finishing third in the Men's 10m Platform Diving Final.
Benjamin Wess of Germany is comforted by a teammate while celebrating winning the gold medal against Netherlands in the Men's Hockey gold medal match.
Usain Bolt of Jamaica receives the relay baton from Yohan Blake of Jamaica next to Tyson Gay of the United States during the men's 4x100-meter relay final.
No. 14 Fabiana Oliveira of Brazil reacts after defeating the United States to win the women's volleyball gold medal match.
Mariya Savinova of Russia celebrates as she crosses the finish line to win gold in the women's 800-meter final.
No. 8 Jaqueline Carvalho of Brazil spikes the ball against the United States' No. 13 Christa Harmotto and No. 4 Lindsey Berg during the women's volleyball gold medal match.
Competitors shoot in the combined running and shooting event in the men's modern pentathlon.
Sanya Richards-Ross of the United States celebrates as she crosses the finish line to win gold in the women's 4x400-meter relay final.
The United States' No. 8 Angel McCoughtry lays the ball up while taking on France during the women's basketball gold medal game.
Tom Daley of Great Britain competes in the men's 10-meter platform diving final.
Sanya Richards-Ross of the United States celebrates after crossing the finish line to win gold in the women's 4x400-meter relay final.
Germany's Maximilian Mueller vies for the ball during the men's field hockey gold medal match between Germany and the Netherlands.
Brigetta Barrett of the United States celebrates winning silver after the women's high jump final.
Kaeo Pongprayoon of Thailand, in blue, reacts as Shiming Zou of China waves the Chinese national flag after being declared winner in the light flyweight boxing final.
Komeil Ghasemi of Iran celebrates winning the bronze medal in the men's 120-kilogram freestyle wrestling.
David Svoboda of Czech Republic celebrates winning the men's modern pentathlon.
No. 10 Kristi Harrower, of Australia, attempts a shot in the first half against No. 12 Irina Osipova, of Russia, during the women's basketball bronze medal game.
Ukraine's Ganna Rizatdinova competes during the Individual all-around rhythmic gymnastics final.
Mohamed Farah, of Great Britain, celebrates as he crosses the finish line to win gold ahead of Ethiopia's Dejen Gebremeskel and Kenya's Thomas Pkemei Longosiwa in the men's 5000-meter final.
Rebecca Henderson of Australia competes in the women's cross-country mountain bike race.
South Korea's pivot Cha Youn Kim, left, shoots during the women's bronze medal handball match between South Korea and Spain.
Azerbaijan's Toghrul Asgarov celebrates with his coach after defeating Russia's Besik Kudukhov in a men's freestyle wrestling gold medal match.
Tamara Echegoyen Dominguez, Sofia Toro Prieto Puga and Angela Pumariega Menendez of Spain lead from Olivia Price, Nina Curtis and Lucinda Whitty of Australia as they compete in women's sailing.
Turkey's Ibrahim Bolukbasi, left, wrestles the United States' Jake Herbert in the men's freestyle wrestling match.
Athletes compete in the men's 5000-meter final.
Spain's Beatriz Pascual races Australia's Regan Lamble during the women's 20-kilometer walk.
Australian guard Jennifer Screen competes in the women's bronze medal basketball game between Australia and Russia.
No. 7 Beatriz Fernandez Ibanez, of Spain, shoots over No. 11 Eun Hee Ryu, of South Korea, during the women's handball bronze medal match.
Emma Green Tregaro of Sweden competes during the women's high jump final.
David Svoboda, right, of Czech Republic competes in the combined running and shooting event in the men's modern pentathlon.
Kenn Shiwan, coach of Nigeria's Chika Chukwumerije, reacts during the men's taekwondo preliminary round.
Brazilian goalkeeper Gabriel Vasconcelos Ferreira fails to catch Mexican forward Oribe Peralta's second goal in the men's football final match.
No. 14 Saori Sakoda of Japan spikes the ball against No. 13 Dae-Young Jung and No. 20 Sook-Ja Lee of South Korea during a women's volleyball match.
The United States' Tervel Ivaylov Dlagnev, right, and Uzbekistan's Artur Taymazov react after Taymazov won a match in the men's freestyle wrestling semifinal event.
British cyclist Annie Last competes in the women's cross-country mountain bike race.
Spectators watch the women's cross-country mountain bike race.
French fighter Anne-Caroline Graffe, right, reacts after her win over South Korean fighter In Jong Lee during the women's taekwondo quarterfinal match.
Women's cross-country mountain bike competitors race down Deane's Drop, a section of the course named for a school.
Brazil's forward Neymar da Silva Santos Junior, known as Neymar, right, clashes with Mexico's goalkeeper Jose Corona during the men's football final match.
Belarus' Liubou Charkashyna performs her ball program during the individual all-around final of the rhythmic gymnastics event.
Indian wrestler Yogeshwar Dutt, in blue, and Bulgarian wrestler Anatolie Ilarionovitch Guidea, meet in the men's freestyle wrestling qualification match.
No. 9 Oribe Peralta, who scored both of Mexico's goals, celebrates with his team after defeating Brazil 2-1 in the men's football final.
South Korea's Woojin Hwang loses control of his horse during the show jumping event of the modern pentathlon.
Lithuania's Justinas Kinderis, front, competes against Poland's Szymon Staskiewicz in a fencing bout during the men's modern pentathlon at the London 2012 Olympic Games.
Japan's Koichiro Morioka gets assistance as he crosses the finish line during the men's 50-kilometer walk.
Canada's Riley McCormick competes in the men's platform diving semifinal.
Hungary's Adam Marosi celebrates winning a fencing bout during the men's modern pentathlon.
Japanese and South Korean players stretch for the ball during the women's volleyball bronze medal match.
South Korea's Yeon Jae Son of competes during the individual all-around rhythmic gymnastics final.
Japan's Kenichi Yumoto, right, wrestles Cuba's Yowlys Bonne Rodriguez in the men's freestyle final match.
Athletes compete during the men's 50-kilometer walk.
Austrian rider Elisabeth Osl rides under a bridge as Japanese rider Rie Katayama crosses over during the women's cross-country mountain bike race.
Australia's Ed Fernon competes in the 200-meter freestyle swimming event in the men's modern pentathlon.
Japanese volleyball players celebrate after their win over South Korea in the women's volleyball bronze medal match.
South Korea's Woojin Hwang looks on in the fencing event during the men's modern pentathlon.
Walkers compete during the men's 50-kilometer walk.
Russia's Sergey Kirdyapkin competes during the men's 50-kilometer walk.
Athletes compete in fencing during part of the modern pentathlon.
Maryna Konieva of Ukraine, left, competes against Nadin Dawani of Jordan during the women's +67-kilogram taekwondo preliminary round. Konieva defeated Dawani to advance to the quarterfinals.
Risa Shinnabe, left, and Erika Araki of Japan celebrate after a point against Korea during the women's volleyball.
United States diver Nicholas McCrory competes in the men's 10-meter platform semifinals.
Yury Postrigay and Alexander Dyachenko of Russia celebrate winning the gold medal in the men's kayak double 200-meter canoe sprint final.
Thomas Daley of Great Britain competes in the men's 10-meter platform diving semifinals.
Sebastian Brendel of Germany competes in the men's canoe single 200-meter sprint final.
Japan's Risa Shinnabe dives to reach the ball during the women's volleyball bronze medal match. Check out photos from the
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