Britain wins 4x100 meters relay as Bolt pulls up

LONDON, Aug 12 (Reuters) - Usain Bolt's final appearance on the track ended in agony on Saturday as he pulled up injured running the final leg of the World Championships 4x100 meters relay as Britain beat the United States for a shock gold medal.

Bolt, who had to settle for bronze in the individual 100 meters, had been hoping to sign off from the sport by leading Jamaica to a fifth successive relay gold but they were already struggling in third when he collected the baton.

Related: Usain Bolt at the championships:

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Usain Bolt at the world championships
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Usain Bolt at the world championships
Athletics - World Athletics Championships - Men's 4x100 Metre Final - London Stadium, London, Britain ? August 12, 2017. Usain Bolt of Jamaica sustains an injury. REUTERS/Kai Pfaffenbach
Athletics - World Athletics Championships ? men?s 4 x 100 meters relay final ? London Stadium, London, Britain ? August 12, 2017 ? Usain Bolt of Jamaica reacts after sustaining an injury.
Athletics - World Athletics Championships - Men's 4x100 Metre Final - London Stadium, London, Britain ? August 12, 2017. Usain Bolt of Jamaica reacts after sustaining an injury. REUTERS/Kai Pfaffenbach
Athletics - World Athletics Championships - Men's 100 Metres Relay Final - London Stadium, London, Britain ? August 12, 2017. Omar McLeod, Julian Forte and Yohan Blake and Usain Bolt of Jamaica react after the final. REUTERS/Phil Noble
Athletics - World Athletics Championships - Men's 4x100 Metre Final - London Stadium, London, Britain ? August 12, 2017. Usain Bolt of Jamaica reacts with Yohan Blake after sustaining an injury. REUTERS/Kai Pfaffenbach
Athletics - World Athletics Championships - Men's 4x100 Metre Final - London Stadium, London, Britain ? August 12, 2017. Usain Bolt of Jamaica reacts after sustaining an injury. REUTERS/Kai Pfaffenbach
Athletics - World Athletics Championships - Men's 4x100 Metre Final - London Stadium, London, Britain ? August 12, 2017. Usain Bolt of Jamaica reacts after sustaining an injury. REUTERS/Kai Pfaffenbach
Athletics - World Athletics Championships ? men?s 4 x 100 meters relay final ? London Stadium, London, Britain ? August 12, 2017 ? Usain Bolt of Jamaica is comforted by his teammate. REUTERS/Lucy Nicholson
Athletics - World Athletics Championships ? men?s 4 x 100 meters relay final ? London Stadium, London, Britain ? August 12, 2017 ? Usain Bolt of Jamaica stumbles injured. REUTERS/Lucy Nicholson
Athletics - World Athletics Championships - Men's 100 Metres Relay Final - London Stadium, London, Britain ? August 12, 2017. Usain Bolt of Jamaica appears injured during the final. REUTERS/Phil Noble
Athletics - World Athletics Championships - Men's 4x100 Metre Final - London Stadium, London, Britain ? August 12, 2017. Usain Bolt of Jamaica reacts after sustaining an injury. REUTERS/Kai Pfaffenbach
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As he tried to gain ground, Bolt pulled up and fell to the floor with what looked like a hamstring injury.

The United States, with individual gold and silver medallists Justin Gatlin and Christian Coleman running the second and fourth legs, had been expected to push the Jamaicans all the way.

Instead, a brilliantly executed race by Chijindu Ujah, Adam Gemili, Danny Talbot and Nethaneel Mitchell-Blake gave Britain gold in 37.47 seconds, the best time in the world this year.

The US took silver in 37.52 with Japan third in 38.04. (Editing by Ian Chadband)

Related: More inside the championship:

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World Championships
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World Championships
Athletics - World Athletics Championships - Men's 100 Metres Relay Final - London Stadium, London, Britain ? August 12, 2017. Usain Bolt of Jamaica reacts after the final. REUTERS/Phil Noble
Athletics - World Athletics Championships ? men?s decathlon victory ceremony ? London Stadium, London, Britain ? August 12, 2017 ? Kevin Mayer of France (Gold) poses with the medal. REUTERS/Matthew Childs
Athletics - World Athletics Championships - Men's 4x100 Metre Final - London Stadium, London, Britain ? August 12, 2017. Yohan Blake of Jamaica passes the baton to Usain Bolt before he sustains an injury. REUTERS/Dylan Martinez
Athletics - World Athletics Championships - Men's 4x100 Metre Final - London Stadium, London, Britain ? August 12, 2017. Adam Gemili of Great Britain celebrates after they won gold. REUTERS/Dylan Martinez
Athletics - World Athletics Championships - Men's 4x100 Metre Final - London Stadium, London, Britain ? August 12, 2017. Nethaneel Mitchell-Blake of Great Britain wins the race ahead of Christian Coleman of the U.S. REUTERS/Kai Pfaffenbach
Athletics - World Athletics Championships ? women?s high jump victory ceremony ? London Stadium, London, Britain ? August 12, 2017 ? Yuliia Levchenko of Ukraine (Silver), Neutral athlete Maria Lasitskene (Gold) and Kamila Licwinko of Poland (Bronze) pose with medals. REUTERS/Matthew Childs
Athletics - World Athletics Championships ? men?s 5000 metres victory ceremony ? London Stadium, London, Britain ? August 12, 2017 ? Mohamed Farah of Britain (Silver) celebrates with his family. REUTERS/Matthew Childs
Athletics - World Athletics Championships - Men's 4x100 Metre Final - London Stadium, London, Britain ? August 12, 2017. Usain Bolt of Jamaica reacts after sustaining an injury. REUTERS/Kai Pfaffenbach
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