Norway’s Karsten Warholm produced a devastating performance to smash his own world record and win the Olympic men’s 400 metres hurdles gold on Tuesday, saying he dreamed about the medal like a maniac. 

Warholm clocked a remarkable 45.94 seconds, pulverising his previous world best of 46.70sec—only four runners in history have clocked sub-47sec times, let alone sub-46.  American arch-rival Rai Benjamin won silver in 46.17sec, with Brazil’s Alison dos Santos claiming bronze in 46.72.