Each athlete races twice over the three-day meet.The series was launched by Michael Johnson, an Olympic gold medalist in 1992, 1996 and 2000 who serves as commissioner.After Kingston, the other three Slams are Miami (May 2-4),

While the new league has a starry field of signed Racers, including the likes of Olympic 200m champion Gabby Thomas and surprise 1500m gold medallist Cole Hocker, the field is also notable for its absences: Jakob Ingebrigtsen, Keely Hodgkinson, and Noah Lyles, for example.