Beijing - Wayde van Niekerk was discharged from the hospital where he was under observation for exhaustion after winning his first world championship title in the 400m on Wednesday.
Despite a lightning quick start, Van Niekerk still held off defending champion LaShawn Merritt and Olympic gold medalist Kirani James to win gold.
After finishing in 43.48 for the sixth-fastest time in history, he collapsed on the track and had to be taken to the hospital for observation.
Just over two hours after his win, he was discharged from hospital, the IAAF said.