James Guy rewrote a five-year-old British record to strike gold at the British Swimming Championships in Glasgow.
Guy erased Davis Davies's 400m freestyle mark from the record books, shaving nearly a tenth off the previous best to clock 3:45.15 for his first national title.
“I’m absolutely over the moon,” said Guy, who finished ahead of Nicholas Grainger and Dan Fogg in the other podium places.
"I thought the time would be nearer 3:46 or 3:47 seconds, so to post a time of 3:45 is great.
“Training at home has been really important, and my training group is such an inspiration to me. The World Championships last year was a nice boost for my confidence and I’m feeling good now for my 200m freestyle later this week.”
Olympic silver medallist Michael Jamieson won the 200m breaststroke title in 2:07.06, just ahead of Adam Peaty and Andrew Willis.
“My heat swim last week at the Scottish Nationals was technically really good but it was important to go faster here," said Jamieson.
"With just over 100 days to go until the Commonwealth Games I’m right where I want to be in terms of preparation for the summer.”
Meanwhile, Siobhan-Marie O'Connor won the 200m freestyle and Aimee Wilmott was a confident winner of the 400m medley.
“This year my freestyle has come on," said O'Connor. "I’ve always had the speed but haven’t been strong enough to hold it together in the field so this has been a great test.”
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