The Latest from the world championships (all times local):
Trinidad and Tobago swept past the United States in the 4x400-meter relay to earn the last big upset of the world championships in the final event.
Lalonde Gordon stayed in the slipstream of Fred Kerley for most of the last lap but then pushed past the American to win in 2 minutes, 58.12 seconds. The U.S. team was second in 2:58.61. Britain took bronze in 2:59.00.
The United States had not lost at the world championships since 2003, but the Americans did lose in the Olympic final at the 2012 London Games in the same stadium.
Allyson Felix and Phyllis Francis won their second gold medals at the world championships by helping the United States win the 4x400-meter relay.
The favored Americans, with 400 champion Francis running the anchor, won in 3 minutes, 19.02 seconds. They finished about 50 meters ahead of silver medalist Britain. Poland took bronze.
Felix also won gold in the 4x100 relay on Saturday. The latest medal was the 16th of her career at the world championships, going back to 2005.
The relay gold also pushed the United States' overall total in London to 29 medals, another American record at the world championships.
Elijah Manangoi led a 1-2 Kenyan finish in the 1,500 meters at the world championships.
Manangoi beat teammate Timothy Cheruiyot for gold. Filip Ingebrigtsen of Norway took bronze.
Three Kenyans were leading with two laps to go but three-time world champion Asbel Kiprop could not sustain the pace and fell back.
Manangoi won in 3 minutes, 33.61 seconds, .38 seconds ahead of Cheruiyot. Ingebrigtsen took third in 3:34.53.
Mutaz Essa Barshim of Qatar won the world high jump title with a perfect series of jumps, clearing 2.35 meters without a miss.
Ilya Ivanyuk of Russia, competing as a neutral athlete because of his country's doping suspension, took silver with a jump of 2.32 meters.
Majd Eddin Ghazal of Syria got bronze jumping 2.29 and beating Edgar Rivera on a countback.
Two-time Olympic champion Sandra Perkovic won the discus at the world championships with a throw of 70.31 meters, well ahead of silver medalist Dani Stevens of Australia.
Stevens set a continental record with a throw of 69.64 meters. Melina Robert-Michon of France took bronze with a toss of 66.21.
It was Perkovic's second world title. She also won gold at the 2013 worlds in Moscow.
Caster Semenya won her third world title in the 800 meters, using her finishing kick to sweep past the competition in the finishing straight and win with ease over Francine Niyonsaba of Burundi.
Ajee Wilson took bronze and gave the United States its 28th medal of the championships, matching its all-time record.
Semenya won with a season-leading 1 minute, 55.16 seconds. The South African beat Niyonsaba by .76 seconds. Wilson finished in 1:56.65.
Semenya won Olympic gold on the same track five years ago.
Hellen Obiri of Kenya ran away from favorite Almaz Ayana with 250 meters to go to win the 5,000-meter race at the world championships and deny the Ethiopian a long-distance double.
Obiri got her final kick going and left Ayana behind, winning in 14 minutes, 34.86 seconds.
After shattering the opposition to win the 10,000, Ayana could never shake her Kenyan opponent and finished 5.49 seconds behind.
Sifan Hassan of the Netherlands took bronze in 14:42.73.
Eider Arevalo won gold in the men's 20-kilometer walk at the world championships.
The Colombian won the race in 1 hour, 18 minutes, 53 seconds. He beat 18-year-old Sergei Shirobokov of Russia by only two seconds.
Caio Bonfim of Brazil was third in 1:19:04.
Yang Jiayu of China won the women's 20-kilometer walk at the world championships.
Yang finished in a personal best 1 hour, 26 minutes, 18 seconds on the two-kilometer loop in central London, only 1 second ahead of Maria Guadalupe Gonzalez of Mexico.
Antonella Palmisano of Italy was third in 1:26:36.
Lyu Xiuzhi had been in line for bronze, but the Chinese walker was disqualified with about 50 meters to go.
Ines Henriques of Portugal set a world record while winning the first women's 50-kilometer walk at the world championships.
Henriques bettered her own record by winning in 4 hours, 5 minutes, 56 seconds on the two-kilometer loop in central London. She set the previous record of 4:08:26 earlier this year.
Yin Hang was second in 4:08:58, followed by Chinese teammate Yang Shuqing in 4:20:49.
Yohann Diniz of France won the men's 50-kilometer walk at the world championships.
The three-time European champion won in 3 hours, 33 minutes, 12 seconds on the two-kilometer loop in central London. At 39, Diniz is the oldest man to win a gold medal at the world championships.
The Frenchman's time was the second fastest in history. Diniz also set the world record of 3:32:33 in 2014.
Hirooki Arai was second in 3:41:17, two seconds ahead of Japanese teammate Kai Kobayashi in third.
The walks set the pace for a furious final day at the world championships with 11 finals and a final tribute to Usain Bolt.
Under clear skies near Buckingham Palace, the men and women walkers both had their 20- and 50-kilometer races before the action was to return to the Olympic Stadium in the evening.
The United States was expected to add more to its medal haul with the 4x400-meter relays, where Allyson Felix is favored to win a 16th world championship medal.
Other finals are in the women's 800, 5,000 and discus, and the men's high jump and 1,500.
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