FIA confirms Mercedes and Ferrari have not been using 'trick oil' systems to gain an advantage over their rivals after detailed investigations of both teams at Canadian Grand Prix.
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.
German says Spielberg win was one of the easiest of his career and proof he's making improvements on the area which cost him 2014 championship.
Mercedes boss Toto Wolff is convinced the title battle will go down to the final race between his two drivers after Nico Rosberg's win in Austria clawed back seven points in the championship.
Says his clutch "just underperformed" off the line, allowing Mercedes team-mate Nico Rosberg past him on the run up to Turn 1 in Austria.
Nico Rosberg won the Austrian Grand Prix to keep in touch with Mercedes team-mate Lewis Hamilton in the championship, beating him off the line and then extending his lead for the rest of the race
World champion's car snapped under braking on the approach to Turn 1 but a late mistake by Nico Rosberg meant he kept pole in Austria.
Takes 45th career pole in session which saw both Mercedes drivers spin off track on final flying laps in Q3.
Says he is looking more at Ferrari's long run pace than the fact Sebastian Vettel topped the qualifying simulations in FP2.
Lewis Hamilton says Mercedes take the threat from Ferrari "very seriously" after Sebastian Vettel outpaced both Hamilton and Nico Rosberg in second practice at the Austrian Grand Prix.
Played down impact of returning to winning ways in Canada but says victory there was important on a personal level after hearbreak of Monaco.
Toto Wolff refuses to write off Ferrari despite the utter dominance of Mercedes' one-two in Montreal.
Says the championship leader can dominate F1 for years to come now he has the car to match his talent at Mercedes.
Team's non-executive chairman and three-time world champion says his and Mercedes' focus is to 'win every bloody race' amidst claims dominance is making F1 boring.
Mercedes said it had to tell its drivers to manage both brakes and fuel during the Canadian Grand Prix, but allowed them to go on full attack for the final ten laps of the race.
German kept Lewis Hamilton in his sights throughout but couldn't get close enough to attempt a pass for the lead.
World champion bounced back from Monaco debacle with controlled victory, says he always has time in pocket over Mercedes team-mate Nico Rosberg
Mercedes was expecting Ferrari to put up more of a fight in qualifying for the Canadian Grand Prix on the back of its power unit upgrade this weekend.
German struggled with grip as he finished three tenths off Lewis Hamilton despite appearing to find a good rhythm on Saturday.
Mercedes dominates qualifying after Sebastian Vettel failed to make Q2 due to MGU-H issue.
Mercedes admitted it was caught out by the worsening conditions that resulted in Lewis Hamilton's accident during second practice at the Canadian Grand Prix.
German thinks Ferrari's pace will give Mercedes something to think about on Friday night ahead of qualifying for the Canadian Grand Prix.
Mercedes dominated the opening practice session for the Canadian Grand Prix with a margin of 1.5s between Lewis Hamilton's timesheet-topping 1:16.212 and Romain Grosjean's Lotus in third.
The latest betting tips from the ESPN team, in association with bet365
ESPN UK is looking to discover which city in the UK is the best place to be for sport - and we need you to help us.
Watch every fixture from March Madness LIVE and on-demand with ESPN Player. Available across Europe, subscribe today.
Save 10% off your first order in the ESPNscrum shop. Replica international and club jerseys, official balls and more.