Kazuki Nakajima claimed the final pre-season P1 position at Jerez on Thursday after netting the fastest lap time of the day - and of the week.
Just two outfits, Williams and McLaren, remained at Jerez for the final day of pre-season testing ahead of next weekend's Australian GP.
It was a day to conduct some last minute tweaking with both Williams and McLaren finding pace they otherwise hadn't shown during the week.
Nakajima proved to the quicker of the two drivers, clocking a 1:17.494 under clear and sunny skies.
It was an impressive lap from the Japanese driver, who eclipsed the previous best time set by Jenson Button on Tuesday by four tenths of a second.
Heikki Kovalainen, spending his second successive day touring the Jerez track in his MP4-24, also broke into the 1:17s, but was just under half a second slower than Nakajima.
1. Nakajima Williams 1:17.494 102 laps
2. Kovalainen McLaren 1:17.946 84 laps
Source : Planet F1