Briton Mo Farah became only the second man to retain both Olympic track long distance titles on Saturday when he produced an utterly dominant performance to add the 5,000m gold to the 10,000 he collected a week ago.
Hot favourite Caster Semenya qualified for the women's 800metres semi-finals at the Rio Olympics with supreme ease on Wednesday and will no doubt be braced for another wave of discussions about her gender should she go on to take the gold medal on Saturday.