The pre-competition favourite added a further two metres to the previous mark, set by recently crowned European champion Zigismunds Sirmais of Latvia in 2011, as he produced a superb effort of 86.48 metres.

South Africa's Johan Grobler took home the silver medal with 80.59m, while bronze went to Grenada's Anderson Peters, who managed 79.65m.

The victory for Chopra saw him enter the record books for two reasons as he also became the first athlete from his country to win a World Under-20 Championships title.

"I was hoping to improve, but I never expected to throw over 86 metres and break the world U20 record,” said Chopra. 

“My ultimate target this year was to qualify for the Olympics, but I didn’t make it. 

"My other goal was to win at the World U20 Championships.”

Elsewhere, Michael Norman, the 200m champion, Hakim Montgomery, Brandon Tayor and Noah Lyles, winner of the 100m, conjured another spirited display on the track on their way to gold in the 4x100m relay in a world leading time of 38.93.

The American quartet edged out the Japanese team of Ippei Takeda, Jun Yamashita, Wateru Inuzuka and Kenta Oshima by crossing the line in the fifth-fastest time ever recorded at under-20 level.

Roger Gurski, Thomas Barthel, Niels Torben Giese and Manuel Eitel claimed bronze for Germany.

The American women swiftly followed suit as Tia Jones, Taylor Bennett, Kaylor Harris and Candace Hill also ran a world leading time, sealing gold in 43.69 ahead of the French and German quartets.

Jaheel Hyde, who was second at the recent Jamaican National Championship, comfortably surged to his second gold medal of the event by clocking 49.03sec to win the 400 metres hurdles.

Taylor McLaughlin of the United States did enough for silver, 0.42 seconds adrift of Hyge, while there was a rare medal for the British Virgin Islands thanks to Kyron McMaster's bronze.

Bahrain's Rio 2016-bound sprinter Edidiong Ofonime Odiong lived up to the hype in the women's 200m as she clinched gold in a national record time of 22.84.

Evelyn Rivera of Colombia, who was fifth in the 100m in Bydgoszcz, sealed silver, with France's Estelle Rafai rounding off the podium by finishing third.

Ethiopia again reigned supreme in the distance events as Selemon Barega outsprinted Djamal Direh of Djibouti to take victory in the men's 5,000m in 13min 21.21sec, with Wesley Ledama of Kenya clinching bronze.

Earlier on in the day, Barega's compatriot Kalkidan Fentie upset the rest of the field in the women's 5,000, powering to the gold medal in 15:29.64, overcoming Kenyan Emmaculate Chepkirui and Ethiopian-born Bahraini Bontu Rebitu.

Another athlete who clocked a world leading time was Britain's Callum Wilkinson picked up his nation's first title of the week by winning the men's 10,000m race walk in 40:41.62.

Ecuador's Jhonatan Amores took second in 40:43.33, while Turkey’s Salih Korkmaz was third in a national under-20 record of 40:45.53.