Williams set the fastest lap of the Barcelona tests so far to offer the first compelling piece of evidence that Mercedes may not have it all their own way in 2015.
McLaren’s troubled pre-season has suffered yet another setback with a hydraulics leak forcing the team to abandon Day One running after seven laps.
Fernando Alonso was rendered unconscious during his accident in testing at Barcelona last week, McLaren boss Ron Dennis has confirmed.
Force India's 2015 car, the VJM08, has finally been revealed with the team expecting to be in action from Friday onwards in Barcelona.
Fernando Alonso will sit out this week's final pre-season test in Barcelona following his testing accident on Sunday.
Who was quickest each day, what tyres were the fastest laps set on and who has racked up the most laps during testing?
The Sky Sports Digital team will once again be providing live commentary from dawn until dusk from the final four days of pre-season testing .
Toro Rosso rookie Carlos Sainz says his "heavy accident" on the final day in Barcelona couldn't take the shine off a breakthrough day.
Nico Rosberg says he and Mercedes are feeling “confident” about their 2015 chances after another impressive four days of testing.
McLaren's difficult pre-season encountered a further setback as Fernando Alonso's crash ended their test early in Barcelona.
McLaren's Fernando Alonso has been released from hospital three days after suffering concussion in his testing crash in Barcelona.
Who's looking good for F1 in 2015 - and who's not: A rundown of how each team fared in the first Barcelona test
Jenson Button has dismissed talk that McLaren-Honda's winter travails have automatically set them up for a troubled 2015 season.
World champion Lewis Hamilton is expecting a “harder fight” between Mercedes and their title rivals in the new season.
Sebastian Vettel says world champions Mercedes are “still the team to beat” despite Ferrari’s fast start to 2015.
Lotus set the fastest time of the Barcelona test so far as McLaren-Honda ran into yet more problems on day three.
Fernando Alonso has reaffirmed his belief that McLaren-Honda will be a winning partnership after “a beautiful day” in the car in the Barcelona sun.
Nico Rosberg believes Mercedes' rivals have “stepped up their game” in 2015 with Ferrari causing the biggest surprise.
Red Bull and Mercedes both offered a glimpse of their potential pace on the second day of the Barcelona test.
New Ferrari boss Maurizio Arrivabene sees no reason to revise the team’s 2015 targets despite their fast testing pace.