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Mo Farah is hoping for a "real, proper race" in Birmingham on Sunday as he tries to put one over his World Championship rivals.
Britain's double Olympic champion will be up against several runners keen to prevent him getting him two more gold medals in Moscow in August in the 5,000 metres at Birmingham's Alexander Stadium.
They include the world's two fastest men over the distance this year, Ethiopian pair Yenew Alamirew and Hagos Gebrhiwet, as well as their compatriot Ibrahim Jeilan, who beat Farah to the world 10,000m title two years ago.
"This is where it starts, it's the big one," Farah said. "It's a real, proper race, there's no-one missing in terms of the field.
"Everyone's there pretty much - all the guys who have been competing in the Diamond League and running decent times. It's a very strong field."
And Farah insisted he wasn't going to rest on his laurels
"You're a world champion, Olympic champion, but you can't look at what you did last year or the year before. You're only as good as the last race, for sure. All eyes are on you, all the guys are working hard."
Other leading athletes in action Sunday are Botswana's Amantle Montsho, who has run the three fastest times over 400m this year, with home favourite Christine Ohuruogu, the Beijing Olympic champion over the distance, one of her opponents on Sunday.
Meanwhile the men's 400m hurdles features the London 2012 medallists in the event in Olympic champion Felix Sanchez, Michael Tinsley and Javier Culson.