Usain Bolt won a rarely contested 300-metre race in 30.97 seconds in rain at the Golden Spike on Thursday.
Bolt, who holds the world records in the 100m and 200m, was boosted by a solid start and cruised to an easy victory. But the wet track, marked by puddles, prevented him from challenging the world mark of 30.85s set by Michael Johnson at Pretoria in 2000.