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The road to Tokyo 2020 begins for Britain's sprinters at the World Relay Championships in Yokohama, Japan, from 11-12 May.
The BBC has live coverage on the Red Button, iPlayer, Connected TV and online, as well as highlights on BBC Two.
Britain's men won the world 4x100m title in 2017 and will be optimistic about taking the World Relays crown with three of that victorious quartet - Adam Gemili, Nethaneel Mitchell-Blake and CJ Ujah - in action in Japan.
Only Dina Asher-Smith will be missing from the women's quartet that won 4x100m silver at the last World Championships.
In the 4x400m, Emily Diamond, Eilidh Doyle and Anyika Onuora all have Olympic bronze medals from 2016, while Martyn Rooney headlines a men's squad that also includes fellow world bronze medallists Dwayne Cowan and Rabah Yousif.
Among the global stars in action are American world 100m champions Justin Gatlin and Tori Bowie, two-time Olympic 100m champion Shelly-Ann Fraser-Pryce and double Rio 2016 champion Elaine Thompson.
As well as the regular relay events seen at the Olympics, the championships also include mixed relays and the 4x200m.
Britain will be fielding a team in the mixed 4x400m, which will be introduced to the World Championships schedule for the first time ever in Doha later this year, but will not be competing in the 4x200m, shuttle hurdles or 2x2x400m relays.
Asha Philip is one of three members of the GB women's team competing in Yokohama that won 4x100m silver at the 2017 World Championships
All times BST and subject to change. Network coverage in bold.
Live coverage
10:30-14:00, BBC Red Button and online
Schedule
10:38 - Mixed shuttle heats
11:00 - Women's 4x400m heats
11:35 - Men's 4x400m heats
12:13 - Women's 4x100m heats
12:40 - Mixed 2x2x400m final
13:00 - Men's 4x100m heats
13:23 - Mixed 4x400m heats
13:55 - Mixed shuttle final
Live coverage
10:00-13:00, BBC Red Button and online
Schedule
10:10 - Women's 4x200m heats
10:31 - Men's 4x200m heats
10:52 - Women's 4x400m B final
11:05 - Men's 4x400m B final
11:21 - Women's 4x400m final
11:37 - Men's 4x400m final
11:53 - Mixed 4x400m final
12:09 - Women's 4x200m final
12:23 - Men's 4x200m final
12:37 - Women's 4x100m final
12:52 - Men's 4x100m final
Highlights
17:00-18:00, BBC Two (repeat 20:00-21:00 & 23:00-00:00, BBC Red Button)
National and regional variations have been included in this list where possible. Please check your local listings for more detailed information.
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