Mo Farah topped a host of British Olympic heroes who flattered to deceive last weekend as they returned to action in the Diamond League Meeting in Eugene, Oregon.
Double Olympic champion Farah was beaten into second place over 5,000 metres by Kenyan Edwin Soi, who won in a time of 13 minutes, 4.75 seconds.
Farah had been due to run in the 10,000m race, but changed to the 5,000m after suffering from a stomach virus.
Elsewhere, Christine Ohuruogu had to settle for fourth in the 400m, Perri Shakes-Drayton came sixth in the 400m hurdles and Greg Rutherford could only manage third in the long jump.
Farah's defeat came as a surprise to many considering his recent dominance over the 5,000 and 10,000 meter distances, which began with a silver and a gold at the 2011 World Championships in Daegu, before double success a year later.
But he was uncharacteristically outsprinted by Soi over the final 200m on Saturday. It's not the first time the pair have clashed: they came together at last year's World Indoor Championships when the Kenyan stole bronze from Mo by just one-hundredth of a second in the 3,000m after the two had earlier collided. Soi was then disqualified after a British protest, but was reinstated on appeal. Farah remained positive however, tweeting after the race: "I will be back for sure!"
Rutherford managed a jump of 8.22m with his final attempt on Friday, but the Olympic Champion was still some way short of winner Aleksandr Menkov, whose effort of 8.39m was his personnal best. Brazilian Mauro Vinicius Da Silva was second.
He tweeted: "Missed opportunity to jump really big. Not happy but a great comp! Just getting started."
Ohuruogu, a gold medal winner in Beijing in 2008, ran solidly, but was over a second behind the winning time of Botswana's Amantle Montsho, who followed up her success from last week in New York with a comfortable victory in 50.01 seconds.
Shakes-Drayton, who missed out on her Olympic final last year, was never in contention in the 400m hurdles but at least had the consolation of beating Olympic champion Natalya Antyukh of Russia.
Czech Zuzana Hejnova finished more than two seconds ahead of the British runner, winning in the fastest time recorded this year - 53.70 seconds.
In the women's 1500m Hannah England finished in a respectable eighth place while her compatriate Laura Wightman came 11th. Marilyn Okoro finished sixth in the 800m.
Britain's Andrew Osagie managed fifth in the 800m, Robbie Grabarz achieved his season-best of 2.26m in the high jump, Yamile Alsama came eighth in the triple jump and Steve Lewis finished sixth in the pole vault.
Former Olympic champion Justin Gatlin won the 100m in an impressive 9.88 seconds, while other winners included two-time Olympic champion Shelly-Ann Fraser-Pryce (10.71) of Jamaica, in the 100m, and reigning 10,000m Olympic champion Tirunesh Dibaba (14:42:01), of Ethiopa, in the 5,000m.
With Auguest's World Championships in Moscow just around the corner, the Diamond League meetings in Birming (30th June) and London (26-27 July) are expected to draw many of the sport's biggest names.
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