Watch live coverage from the final day's action of the World Championships in Moscow.
The championships conclude with the sprint relays, which brought world records at the Olympic Games last summer for Jamaica's men and USA's women.
Usain Bolt and co will again be expected to win the men's race, but there could also be a medal chance for Great Britain - provided they can buck their recent trend and get the baton round safely.
This is a live BBC One stream - due to start at 12:40 BST
Available to UK users only.