Eilidh Child came off second best in her first meeting of the summer with rival Perri Shakes-Drayton at the BT Great Citygames in Manchester.
The Londoner delivered a formidable display over the rarely-run 200 metres hurdles to set a new world record of 25.74 seconds.
Child, recovering from a poor start, was just edged into third by Olympic champion Natalya Antyuk on the specially-constructed straight street circuit in the centre of Manchester.
“That was strange,” said Shakes-Drayton. “I had girls beside me. I’m not used to that.”
Allyson Felix of the United States won the 150 metres in a world’s best 16.36 seconds ahead of Britain’s Anyika Onuora Paralympic silver medallist Stef Reid was third in the 100 metres behind world record holder Marlou van Rhijn with the Scot also taking third in the T44 long jump.
Olympic gold medallist Greg Rutherford won the long jump with a best of 7.99m.
London 2012 Paralympics champion Jonnie Peacock won the IPC men’s 100m T43/44 event.
There was disappointment for Phillips Idowu at the IAAF Diamond League meeting in New York. The 34-year-old triple jumper was hoping to compete for the first time since being eliminated in the first round at London 2012.
However, the Briton was listed as “did not start” moments before the event was due to get under way.
Meanwhile, Andi Jones plans to use today’s Edinburgh Marathon as a platform to challenge for a spot at next year’s Commonwealth Games.
The Manchester-based veteran will lead the domestic contingent in the capital race with Ukrainian Olympian Ivan Babaryka and Ethiopia’s Wondimnew Melkamu heading the overseas challenge.
And even with no British men deemed worthy of selection for this summer’s world championships, Jones insists that there will be ample competition for places for the home nations at Glasgow 2014.
“There are some pretty useful British marathon runners out there,” Jones said. “Andrew Lemoncello’s top-class if he can get injury-free again. Mo Farah obviously will give us something impressive when he does a full distance. Look at Derek Hawkins, a young Scottish lad. He did 2:14 on his debut.
“I know a lot of guys didn’t click in London this year. But that’s marathon running. If you have a good day, it all goes well. When you have a bad day, you can be shocking.”
Kenya’s Risper Kimaiyo is favourite for the women’s race in Edinburgh.