Bbc sports centre. Stay. For sportsday. Hello there. Im olly foster at the london stadium, this is world athletics sportsday, and this is whats coming up on the programme. Its going to be a farewell for farah. His last race for a global gold. Will it the be a golden goodbye for bolt . Its the relay, then retirement. And, with six finals tonight, Katarina Johnson thompson gets a Second Chance to make it onto the podium. Im Lizzie Greenwood hughes. Also coming up in the programme. The defeated champions chelsea are beaten by burnley in their opening game of the season. But its terrific for the terriers. Promoted huddersfield beat Crystal Palace 3 0. Good evening. And what an evening gets going to be on the ninth day of these world athletics championships, on the penultimate evening. Two figureheads of atheltics will be leaving the sport tonight. 29 World Championship and olympic golds between them. We have about three hours before usian bolt bows out of the sport, and in the next two hou