German picks up where he left off during Austrian Grand Prix by ending the test over eight tenths clear of Ferrari's Esteban Gutierrez.
Finn clocked a 1:10.029 in the FW37, while Nico Rosberg finished the morning third for Mercedes and Fernando Alonso managed just 17 laps in the McLaren MP4-30.
Mercedes junior keeps the world champions top of the timing screens after day of testing hampered by rain at Red Bull Ring.
Felipe Massa and Valtteri Bottas backs team to be strong in Spielberg after qualifying fourth and sixth.
Massa nearly ran over Ferrari boss in pit wall but managed to stop short - something the pair shared a joked about later on during Friday practice.
Finn returns to popular fan event for second year in a row and will get behind the wheel of the Ferrari F10, with Felipe Massa also set to attend in a 1990 Williams.
Brazilian encouraged by Ferrari's lack of apparent progress with upgraded power unit and calls on Williams to apply pressure to his former team.
Finn scores Williams first podium of the season and thinks it will be a huge boost to the team with an upgrade due at the next race in Austria.
A faulty fixing on the wastegate mechanism of the turbocharger was to blame for Felipe Massa's lack of power during the Canadian Grand Prix.
Verstappen hits back at Brazilian driver's criticism of him following Monaco Grand Prix clash with Romain Grosjean.
Williams driver slams 17-year-old Verstappen after his heavy collision with Romain Grosjean in closing stages of Monaco Grand Prix.
Two-time world champion says Bottas' management hold the key to his future success as speculation linking his fellow Finn to Ferrari seat continues.
F1 photographer Mark Sutton talks ESPN through his favourite snaps from the Spanish Grand Prix.
Finn held off a Ferrari - this time fellow countryman Kimi Raikkonen - for fourth in the second race in a row and praised team's strategy.
Finn qualifies within two tenths of Sebastian Vettel and will line up fourth for Spanish Grand Prix.
Brazilian makes a light-hearted remark about Barcelona's star player after seeing him orchestrate a 3-0 win over Bayern Munich on Wednesday.
Finn laughs off 'funny stories' of a pre-agreement with Ferrari for 2016 or 2017 but admits he is yet to sign an extension at Williams either.
Ferrari boss refuses to deny speculation the Italian outfit has already signed a pre-agreement with Valtteri Bottas about joining in 2016 or 2017.
Team insists report highlights on-track struggles before 2014 and expects next year's financials to be 'materially more favourable'.
Williams' head of performance engineering says team needs to develop 'whole car package' at a faster rate to cut the deficit to Ferrari.
ESPN rounds up the best radio soundbites from the Bahrain Grand Prix as Kimi Raikkonen recorded an overdue return to the podium.
ESPN rounds up all the reaction from up and down the paddock after the Bahrain Grand Prix
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