Highlights from the 2017 IAAF world track and field championships

Usain Bolt pulled up hurt in the 4x100 relay final during the world championships on Saturday.

United States Justin Gatlin embraces Tori Bowie after the men's 4x100 relay final in which the USA took the silver medal during the World Athletics Championships in London Aug. 12. Bowie won gold in the women's 4x100.

Dafne Schippers (NED) wins women's 200m heat in 22.63 during the IAAF World Championships in Athletics at London Stadium at Queen Elizabeth Park.

Emma Coburn (USA) and Courtney Frerichs (USA) take a victory lap with United States flags after placing first and second in the women's steeplechase in a championship record 9:02.58 and 9:03.77 during the IAAF World Championships in Athletics at London Stadium at Queen Elizabeth Park.

Phyllis Francis takes a victory lap with the United States flag after wining the women's 400-meter race in 49.92 seconds during the IAAF World Championships in Athletics at London Stadium at Queen Elizabeth Park.

Norway's Karsten Warholm takes a victory lap after winning the 400-meter hurdles during the IAAF World Championships in Athletics at London Stadium at Queen Elizabeth Park.

Norway's Karsten Warholm wins the 400-meter hurdles in 48.35 seconds during the IAAF World Championships in Athletics at London Stadium at Queen Elizabeth Park.

China's Lijiao Gong wins the women's shot put at 65 feet, 5 inches (19.94 meters) during the IAAF World Championships in Athletics at London Stadium at Queen Elizabeth Park.

The U.S.'s Sam Kendricks takes a victory lap with a United States flag after winning the pole vaultduring the IAAF World Championships in Athletics at London Stadium at Queen Elizabeth Park.

Sam Kendricks of the U.S. and Renaud Lavillenie of France embrace after placing first and third in the pole vault during the IAAF World Championships in Athletics at London Stadium at Queen Elizabeth Park.

The U.S.'s Evan Jager places third in the steeplechaseduring the IAAF World Championships in Athletics at London Stadium at Queen Elizabeth Park.

South Africa's Wayde Van Niekerk defeats Steven Gardner of Bahrain to win the 400 meters at the IAAF World Championships in Athletics at London Stadium at Queen Elizabeth Park.

France's Pierre-Ambroise Bosse poses for a selfie with fans after winning the 800m during the IAAF World Championships.

Poland's Piotr Lisek places second in the pole vault at 19-feet, 3 3/4 inches during the IAAF World Championships in Athletics at London Stadium at Queen Elizabeth Park.

Jenny Simpson of the USA celebrates after closing fast in the 1,500 final to claim silver.

Faith Kipyegon of Kenya sprints down the homestretch on her way to gold in the 1,500. Jenny Simpson of the USA would pass Laura Muir of Great Britain and Sifan Hassan of Netherlands to take silver.

Omar McLeod of Jamaica wins the 110 hurdles ahead of Sergey Shubenkov of Russia (competing independently).

Allyson Felix of the USA advances to the final of the 400.

Omar McLeod celebrates with Jamaican fans after winning the 110 hurdles.

Sandi Morris of the USA receives her silver medal from the pole vault.

The medalists in the 100 (decided on Day 3), left to right, Marie-Josee Ta Lou of Ivory Coast (silver), Tori Bowie of the USA (gold) and Dafne Schippers of Netherlands (bronze).

Anita Wlodarczyk of Poland takes a victory lap after winning the hammer throw.

Kerron Clement of the USA advances to the final in the 400 hurdles.

Shamier Little the USA advanced in the 400 hurdles on Day 4, but she broke one of the barriers along the way.

Tori Bowie takes her victory lap.

Tori Bowie of the USA leans at the line to defeat Marie-Josee Ta Lou of Ivory Coast in the 100 final.

Katerina Stefandi of Greece celebrates her gold in the pole vault.

Sandi Morris of the USA takes silver in the pole vault.

Shot put gold medalist Tomas Walsh of New Zealand.

Joe Kovacs of the USA ends up with silver in the shot put.

Nafissatou Thiam aka Nafi Thiam of Belgium embraces Antoinette Nana Djimou Ida of France after winning the heptathlon.

U.S. heptathletes (left to right) Kendell Williams (finished 12th), Sharon Day-Monroe (20th) and Erica Bougard (18th).

Gold medalist Justin Gatlin of the USA and bronze medalist Usain Bolt of Jamiaca on the medal stand the day after the 100 final.

Amy Cragg of the USA after earning bronze in the marathon.

Rose Chelimo of Bahrain wins the women's marathon.

Geoffrey Kipkorir Kirui of Kenya celebrates winning the men's marathon.

Allyson Felix of the USA wins her heat in Round 1 of the 400.

Evan Jager of the USA advances in the steepleachase.

Reigning Olympic champ Shaunae Miller-Uibo of Bahamas wins her 400 heat.

Aries Merritt of the USA led the way in Round 1 of the 110 hurdles.

Sam Kendricks of the USA clears 18-8 1/4 (5.70m) to advance to the pole vault final.

Justin Gatlin of the USA celebrates winning gold in the 100, 12 years after his first world championships gold.

Usain Bolt soaks up the adoration of the fans.

Gold medalist Justin Gatlin embraces bronze medalist Usain Bolt .

Even in defeat, Usain Bolt gives the crowd what it wants to see.

Christian Coleman of the USA, silver medalist in the 100.

Bottom to top, Reece Prescod of Great Britain, Justin Gatlin of the USA (gold), Yohan Blake of Jamaica, Akani Simbine of South Africa, Christian Coleman of the USA (silver), Usain Bolt of Jamaica (bronze), Jimmy Vicaut of France and Bingtian Su of China at the finish line of the 100.

Almaz Ayana of Ethiopia blazes to victory in the 10,000.

Jarrion Lawson of the USA took second in the long jump with a leap of 27-8 1/4 (8.44m).

Mason Finley of the USA earns bronze in the discus.

Usain Bolt (C) of Jamaica at the start of his 100 semifinal.

Kara Goucher of the USA, left, wipes away a tear as she stands with Britain's Jo Pavey on Day 2. Goucher, silver, and Pavey, bronze, received reallocated medals for the women's 10,000 at the World Championships in Osaka in 2007. The original silver medalist was stripped of her medal because of a positive doping test.

World recordholder Wayde Van Niekerk of South Africa advances in the 400.

The USA's Ariana Washington advances to the semifinals in the 100.

DeAnna Price of the USA competes in hammer qualifying.

Donovan Brazier of the USA wins his heat of the 800 in 1:45.65.

Kendell Williams (left) and Erica Bougard of the USA start their heptathlon competition on Day 2.

Ryan Whiting of the USA throws 68-4 1/2 to qualify in the shot put.

LaShawn Merritt of the USA began his competition in the 400. He qualified for the semifinals.

Sandi Morris of the USA qualified easily in the pole vault.

Mo Farah of Great Britain wins the 10,000 to close out Day 1.

Usain Bolt of Jamaica wins his heat in the first round of the 100.

Christian Coleman of the USA wins his first-round heat in the 100.

Francena McCorory, Ashley Spencer, Natasha Hastings and Jessica Beard of the USA pose with their gold medals which they received during the IAAF World Championships in London, after being promoted from second place to first for their performance in the women's 4x400 relay from the 2013 world championships.