Sunday is the last chance for all the teams to get the laps under their belts, complete their development programmes and try to iron out any issues with their new cars before pre-season testing in Bahrain is over.
This shortened, three-day test will finish at 7pm local time on Sunday evening, and the cars then won't run again until first practice for the Bahrain Grand Prix in two weeks.
Almost all the drivers are due to be on track at some point, with George Russell getting his first laps of the test, after Roy Nissany and Nicholas Latifi drove for Williams on Friday and Saturday respectively.
Only Latifi and Antonio Giovinazzi will not be in the car today, with the latter sitting out the final day after running all day on Saturday. Kimi Raikkonen will be handling driving duties for Alfa Romeo.
Check out the gallery above to see the cars and drivers on track - and we'll be adding more pictures throughout this final day in Bahrain.