Adam Peaty has set a world record time of 26.10 seconds in the heats of the 50 metres breaststroke at the World Championships in Budapest.
It comes less than 24 hours after he won the 100 metres breaststroke.
The 22-year-old Uttoxeter swimmer set the world record of 26.42 seconds en route to winning 50m breaststroke gold in Kazan, Russia two years ago.
Peaty was optimistic of going quicker in the non-Olympic event after a halfway split of 26.50secs in the 100m, which he had also won in 2015.<
He predicted "something special" and delivered - clocking 26.10 in the morning heats.
Cameron van der Burgh of South Africa was second quickest in 26.54. The 0.44 margin is huge over one length.
Peaty said did not expect a world record on Tuesday morning - and certainly not by going 0.32 quicker than his previous best.