Five things to watch out for

THE BOLT FAREWELL — the biggest superstar in the history of athletics due to bow out after contesting the 100m and 4x100m relay.

THE RISE OF DE GRASSE — Andre de Grasse has been getting under Bolt’s skin and is his biggest threat in the 100m.

THE WAYDE VAN NIEKERK PHENOMENON — The Olympic 400m champion is the only man in history to go beneath 44sec in the 400m, 20sec in the 200m and 10sec in the 100m.

THOMPSON V SCHIPPERS — Dafne Schippers, the 200m world champion from Holland, admits she and Jamaican rival Elaine Thompson do not like each other.

CASTER SEMENYA — expect the recurring controversy and questions over her sex that greet the 26-year-old’s every appearance.