Keely Hodgkinson will compete in the women's 400m at the UK Athletics Championships in Birmingham this weekend - an event you can watch live on the BBC's digital platforms.
The Olympic 800m champion is seeking to build speed as she gears up for a potential world record attempt later this summer.
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Hodgkinson started her outdoor season by running a 400m personal best time of 51.14 seconds in finishing seventh at the Rome Diamond League meeting earlier in June.
The Leigh Harrier ran another personal best - improving her 800m British record to one minute 54.33 seconds - three days later in the 800m at the Stockholm Diamond League.
However, the 24-year-old had to settle for second place behind Switzerland's Audrey Werro, who ran the third fastest women's 800m time ever of 1:53.98.
Hodgkinson, who broke the 800m indoor world record in February, will compete against the likes of British 400m record holder Amber Anning and British indoor champion Yemi Mary John at Alexander Stadium.
The women's 400m heats take place at 16:06 BST on Saturday and the final is at the same time on Sunday.
After this weekend, Hodgkinson is due to compete in Diamond League meetings in Eugene and London in July before seeking revenge over Werro at the European Championships in Birmingham in August.
Who else is competing?
Georgia Hunter Bell, who won silver at last year's World Championships, will be the favourite to win the women's 800m in Hogkinson's absence.
The women's 100m and 200m sprints will perhaps be the most hotly contested races with Dina Asher-Smith, Amy Hunt and Daryll Neita set to go head to head.
Zharnel Hughes, Jeremiah Azu, Romell Glave and Louie Hinchliffe will battle it out in the men's 100m, while home favourite Matthew Hudson-Smith - who now has a stand named after him at the stadium - and Charlie Dobson are in the men's 400m.
Rabat Diamond League winner Max Burgin, Ben Pattison and Jake Wightman will compete for the men's 800m title.
Scott Lincoln will seek to win the men's shot put for an 11th consecutive year, while Adele Nicholl will defend her women's shot put title having returned to athletics after competing in the bobsleigh at the Winter Olympics in Italy.
World and Paralympic champion Jonnie Peacock competes in the men's 100m ambulant race, while Melanie Woods will go head to head with Kare Adenegan in the women's 400m wheelchair race.
What's at stake?
As well as national titles, places for the European Athletics Championships, which take place at the same venue in August, will also be up for grabs.
Athletes need to win their event while also achieving the European qualifying standard outlined in the team selection policy to book their place.
Izzy Fry and Joe Wigfield have already qualified by winning the 10,000m trial races in Loughborough in May.
Asher-Smith, Hodgkinson, the women's 4x100m relay team and the women's half marathon team won Britain's four gold medals at the last Europeans in Rome in 2024.
How to watch on the BBC
The UK Championships at Alexander Stadium will be shown live on BBC iPlayer, the BBC Sport website and the BBC Sport app from 11:35-19:30 BST on Saturday and 11:25-16:45 BST on Sunday.
Key event times
Saturday, 20 June
15 finals including:
19:06 - women's 400m wheelchair final
19:14 - women's 100m final
19:24 - men's 100m final
Sunday, 21 June
26 finals including:
15:30 - men's 200m final
15:39 - women's 200m final
15:48 - men's 400m final
16:06 - women's 400m final
15:57 - women's 800m final
16:14 - men's 800m final
16:24 - men's 1500m final
16:34 - women's 1500m final
Event times and starting lists are subject to change