Usain Bolt secured a sweep of sprint golds at the World championships for the third time as Jamaica won the 4×100 metres relay.
Aided by a US disqualification, the Jamaican comfortably added to his 100 and 200 metres titles.
It was a record-extending 11th world gold for Bolt, who also won three sprint titles at the 2009 and 2013 world championships.
The United States team featuring Justin Gatlin, who won silver behind Bolt in both individual sprints, botched their final handover between Tyson Gay and Mike Rodgers and were disqualified after finishing second. Britain did not finish after bumbling their final handover.
That elevated hosts China to a hugely popular silver medal in 38.01 with Canada taking the bronze in 38.13.
The Jamaican women matched the men and set the second fastest time in history to retain their 4×100 metres relay title.
Britain’s Mo Farah also ran into the record books by winning the 5,000 metres – his third successive distance double at a major championships.
It was a day to remember too for Ashton Eaton who broke his own world record with a score of 9,045 points.
He finished second in the 1500M to win the decathlon world title.
Marina Arzamasova of Belarus outsprinted the Kenyan defending champion Eunice Sum down the home straight to win gold in the women’s 800 metres.
Elsewhere, Mariya Kuchina won the women’s high jump with a clearance of 2.01 metres to become Russia’s second gold medallist at this world championships.
The 22-year-old from Moscow had a blemish-free card to that height, her lifetime best performance.
And Piotr Malachowski of Poland claimed the discus gold medal with a throw of 67.40 metres.
The 32-year-old Pole dominated the event to finally win the world title after landing silver medals in 2009 and 2013 and being Olympic runner-up in the same Bird’s Nest Stadium seven years ago.