Everything you need to know the about 36th event – and the history of marathons past
Thousands seek medical help after race in Qingyuan, where athletes were given scented soaps at the finish
African nation has two months to provide funding and show it is tackling problem or it will be declared non-compliant like Russia
African team could pull out of Games if virus reaches epidemic proportions in Brazil
Company's decision to withdraw from sponsorship deal may be more to do with hard-headed business than concerns over doping
IAAF top brass 'not unaware' of the flouting of rules - but if Coe does not lead athletics out of the crisis who will?
Russia faces Olympic expulsion amid fears that other sports and nations could be dragged into a sprawling political and sporting scandal
Jamaican sprint king says he is only 50-50 to make it to London in 2017 and could retire after Rio Olympics
Jamaican sprinter storms to 200m victory but is brought back down to earth during lap of honour – video
Fourth major title puts 'mediocre' long-jumper alongside Thompson, Christie, Gunnell and Edwards
Jamaican 'saviour' comes good when it matters as rival Gatlin cracks under pressure in Beijing
Jamaican sprinter cast in the role of athletics saviour against American rival tarnished by two drugs bans
The former Olympic gold medalist and man behind London 2012 must tackle the doping crisis facing his sport
Olympic medal winners are among those to return 'suspicious' blood tests, but so far they have remained anonymous
Five athletes who will be the main attractions at the Olympic Stadium this weekend – in pictures
Out-of-form Jamaican promises fireworks at the Olympic Stadium ahead of the World Championships in Beijing
Teenage sprinter from Anguilla can now represent UK, but decision reignites 'plastic Brit' debate
BBC documentary alleges that US coach used 'banned steroids and unethical practices'
Long-distance legend runs her last ever competitive marathon at the age of 41, as Sunday's event is deemed the biggest ever
World record holder Bolt says reducing rival Gay's drugs ban to one year was 'stupid'