Great Britain demoted from third
Great Britain's baton blunders returned to haunt them again at the World Championships in Moscow as the men's 4x100 metres relay team lost their bronze medal after being disqualified.
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Dwain Chambers came flying down the home straight to bring the team home in third place, but after doing a lap of honour they were given the bad news.
The second changeover from Harry Aikines-Aryeetey to James Ellington took place out of the designated box, meaning the result was always likely to be reversed.
UK Athletics confirmed the disqualification and, as a result, Canada were promoted to bronze.
It is the latest in a long line of relay failures for Britain's sprinters. It is the sixth major championship out of seven in which they have failed to get the baton round properly.
UK Athletics performance director and acting head coach Neil Black told the BBC: "It's pretty gutting and I'm sure we all feel the same but that's the sport."
The man Black is filling in for as head coach is Peter Eriksson, who left his position at UKA in late June, to take up the same role with Canada.
The British quartet of Adam Gemili, Aikines-Aryeetey, Ellington and Chambers clocked a season's best 37.80 seconds, but it proved irrelevant.
If British relay blunders have become expected, so too have Jamaican wins and Usain Bolt took his World Championships career medal tally into double figures by anchoring Jamaica to gold.
Bolt claimed his third gold of this year's championships by taking the Jamaica team home in 37.36secs.
He performed a Cossack dance on the track for the Luzhniki Stadium crowd, which looked at the fullest it has been all championships, after the race.
Addressing the crowd, he said: "I am very satisfied. It's a wonderful energy that's coming out."
Bolt has now won 10 World Championship medals, eight gold and two silver, to equal Carl Lewis' men's record.
Men's1500m Final: 1 Asbel Kiprop (Ken) 3mins 36.280secs, 2 Matthew Centrowitz (USA) 3:36.780, 3 Johan Cronje (Rsa) 3:36.830, 4 Nixon Kiplimo Chepseba (Ken) 3:36.870, 5 Homiyu Tesfaye (Ger) 3:37.030, 6 Silas Kiplagat (Ken) 3:37.110, 7 Mekonnen Gebremedhin (Eth) 3:37.210, 8 Henrik Ingebrigtsen (Nor) 3:37.520, 9 Mohamed Moustaoui (Mor) 3:38.080, 10 Nathan Brannen (Can) 3:38.090, 11 Florian Carvalho (Fra) 3:39.170, 12 Chris O'hare (Gbr) 3:46.040
Men's 4x100m Relay Final: 1 Jamaica 37.360secs, 2 United States 37.660, 3 Canada 37.920, 4 Germany 38.040, 5 Netherlands 38.370, 6 Japan 38.390, 7 Trinidad & Tobago 38.570
DQ: Great Britain & Nothern Ireland
Men's Triple Jump Final: 1 Teddy Tamgho (Fra) 18.04m, 2 Pedro Pablo Pichardo (Cub) 17.68, 3 Will Claye (USA) 17.52, 4 Christian Taylor (USA) 17.20, 5 Aleksey Fedorov (Rus) 16.90, 6 Marian Oprea (Rom) 16.82, 7 Gaetan Saku Bafuanga Baya (Fra) 16.79, 8 Fabrizio Schembri (Ita) 16.74, 9 Bin Dong (Chn) 16.73, 10 Dimitrios Tsiamis (Gre) 16.66, 11 Samyr Laine (Hai) 16.09, 12 Yoann Rapinier (Fra) 15.17
Women's 800m Final: 1 Eunice Jepkoech Sum (Ken) 1min 57.380secs, 2 Mariya Savinova (Rus) 1:57.800, 3 Brenda Martinez (USA) 1:57.910, 4 Alysia Montano (Rsa) 1:57.950, 5 Ekaterina Poistogova (Rus) 1:58.050, 6 Ajee Wilson (USA) 1:58.210, 7 Nataliya Lupu (Ukr) 1:59.790, 8 Lenka Masna (Cze) 2:00.590
Women's Javelin Final: 1 Christina Obergfoll (Ger) 69.05m, 2 Kimberley Mickle (Aus) 66.60, 3 Maria Abakumova (Rus) 65.09, 4 Linda Stahl (Ger) 64.78, 5 Kathryn Mitchell (Aus) 63.77, 6 Sunette Viljoen (Rsa) 63.58, 7 Viktoriya Sudarushkina (Rus) 62.21, 8 Lingwei Li (Chn) 61.30, 9 Tatjana Jelaca (Ser) 60.81, 10 Sofi Flinck (Swe) 59.52, 11 Vira Rebryk (Ukr) 58.33, 12 Nadeeka Lakmali Babaranda Liyanage (Sri) 58.16