Men’s 400m Final
9:30pm BBC1, BBC Olympics 1
In an event regarded as one of the most body-breaking in the sport, the USA have won the past seven golds. Only one man, Michael Johnson, has ever successfully defended the title — winning in 1996 and 2000. But his achievement won't be matched in London because LaShawn Merritt, who was a clear-cut winner in Beijing and leads the world rankings this year, pulled up injured in his heat and failed to finish.
Another potentially huge story evaporated when South Africa's Oscar Pistorius, who has artificial legs below his knees, also failed to qualify for the final. Pistorius had made history by being the first amputee sprinter at the Olympics. GB's Martyn Rooney will be another absentee after a disappointing semi-final run.
Merritt's absence leaves the way clear for world champion Kirani James of Grenada to take gold.