Russia's Stanislav Emelyanov checks his time on his way to winning the final of the men's 20km walk. He won in a time of 1hr 20mins 10sec, with an average speed of 9mph, so it's no wonder the TV cameraman needed a motorbike to keep up with himPhotograph: Ian Walton/Getty Images
As the row continues over South African athlete Caster Semenya's eligibility to compete as a female runner, her father defends her and insists she is a girl