Team GB's sprinters put on a stellar show in the 4x100m heats to progress to the finals.
Both the men's and women's teams sailed though their heats to qualify for Friday's races.
The women in particular showed the strength of their form, putting down the fastest time from both heats to go through in first place.
As the athletics draws to a close, here's everything you need to know about the two teams and GB's medal hopes.
Who is in the GB women's 4x100m relay team?
Dina Asher-Smith returned for the 4x100m relay after her individual medal hopes were dashed due to an ongoing injury.
She was joined by Imani Lansiquot, Daryll Neita and Asha Philip to post the fastest qualifying time of the day and a new national record at 41.55 seconds.
It means the team have a good chance at the gold medal, having won bronze in Rio.
However, they will face tough competition from Jamaica and USA, both of whom are likely to mix up their teams.
Either way, it's set to be a great final and Team GB will undoubtedly do all they can to top the podium.
What time is the women's 4x100m final?
The women's 4x100m final will take place at 14:30 UK time on Friday August 6.
GB will take lane 5 with Germany and the USA on either side.
Who's in the GB men's 4x100m relay team?
The GB men's team is made up of Chijindu Ujah, Zharnel Hughes, Richard Kilty and Nethaneel Mitchell-Blake.
After qualifying second in their heat in a time of 38.02 seconds, they will take line 6 in the final, flanked by Jamaica and China.
Relay favourites America crashed out of the heats following some poor baton changeovers, blowing the field open and increasing GB's chances of a medal.
What time is the men's 4x100m final?
The men's final will take place just after the women's, at 14:50 UK time.
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