|Venue: Birmingham. Dates: 3-5 July|
|Coverage: BBC Two and online on Sunday, 5 July 14:20-18:00 BST|
Zharnel Hughes and Cindy Ofili qualified for the World Championships in their first outing as GB athletes.
Anguilla-born Hughes, 19, won the men's 200m at the British Championships in 20.42 seconds.
And US-born Ofili, 20, was second in the women's 100m hurdles in 12.96 to secure her place in Beijing in August.
Hughes, whose Caribbean home is a British Overseas Territory, said: "I've been longing to run in a uniform that says a country on it, so to represent GB, I'll go out there and give it my best."
Ofili was second in her race to older sister Tiffany Porter, 27, who also qualifies for the World Championships.
Jessica Ennis-Hill was third in a season best of 13.10 seconds while Katarina Johnson-Thompson withdrew with cramp.
Porter, the European champion who has competed for Britain since 2010, took the title in 12.83 seconds while Ofili was racing on her first visit to the country.
|Who are the new Brits?|
|Event||Born||How do they qualify?|
|Zharnel Hughes, 19||200m||Anguilla||Has held British nationality since birth|
|Cindy Ofili, 20||100m hurdles||United States||Dual nationality through her mother, along with sister and GB hurdler Tiffany Porter|
|Shante Little, 22||400m hurdles||United States||Holds British nationality through her Colchester-born mother.|
|Montene Speight, 22||400m||United States||Holds British nationality|
The pair, who hail from Michigan, have a British mother.
Ofili said: "My sister has always said good things about GB and the support and everything that comes with it.
"It was just nice going into it with the knowledge I'd be representing GB."
American-born Shante Little qualified fifth fastest for Sunday's women's 400m hurdles at 15:50 BST, behind European champion Eilidh Child.
But fellow American Montene Speight, who also switched allegiances to Britain, failed to qualify for the women's 400m final, which takes place at 15:30 BST on Sunday.
However, Olympic and double world champion Christine Ohuruogu did qualify for Sunday's final.
Isobel Pooley broke the British outdoor high jump record by clearing 1.97m.
Former Commonwealth and World Champion Dai Greene ran a season's best 50.62 second to qualify third fastest for Sunday's 400m men's hurdles, at 15:02 BST.
The Great Britain team for the World Championships will be selected on 27 July, the Monday following the Anniversary Games.
Ennis-Hill, who won gold in the heptathlon at the London 2012 Olympics, said she would wait until after that event to decide whether to compete at the World Championships.
"I need to do two or three events (at the Anniversary Games) to see if I'm really ready and then I can make a decision and move on for the rest of the season or call it a day.