Jamaican sprint star Usain Bolt will compete in the rarely contested 300-metre race for the first time at the traditional Czech Golden Spike meet in May.
Organisers say Bolt, who holds the world record at 100 and 200 metres, will attempt to break the world mark in the distance on May 27 in Ostrava.
Michael Johnson holds the current mark of 30.85 seconds. The IAAF does not recognise it as a world record, as the distance is not used at major events.
Bolt will reportedly earn more than $300,000 for his participation.
Organisers say he will receive another $30,0000 if he sets a world best.