Britain's Adam Peaty won the 100 metres breaststroke at swimming's world championships on Monday night in Budapest and returned on Tuesday morning to qualify fastest in a world record over 50 metres.
The 22-year-old swimmer set the then world record of 26.42 seconds two years ago en route to winning 50m breaststroke gold at Kazan in Russia.
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" in Hungary 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's 100m title was one of two gold medals on day two for Britain, with Ben Proud winning the non-Olympic 50m butterfly.
