Valtteri Bottas has ended the final day of pre-season testing on top of the timesheets, with a lap time of 1:16.196.
No driver failed to beat the fastest time from week one - 1:15.732 - which was set by Bottas on day three. Max Verstappen and Daniel Ricciardo were second and third behind the Finn, both less than a tenth down.
Charles Leclerc was fourth, setting the most amount of laps from any driver during the day - a massive 180.
Following the Monegasque driver was reigning world champion Lewis Hamilton whose fastest time was just over two-tenths slower than Bottas'.
No red flags were deployed during the day, with the biggest drama coming in the morning following a spin into the gravel for Alexander Albon.
However, the Thai-British driver was able to get his car back onto the circuit by himself and return to the pits. He was 14th and last at the end of the day.
The F1 season is set to begin in two weeks' time at the Australian Grand Prix, where a true understanding of the grid's pecking order will become clearer.
Bahrain International Circuit - Winter testing