Williams defended their young and inexperienced Formula One drivers
Mexican Esteban Gutierrez will race with Swiss-based Sauber for a second season next year with Russian teenager Sergey Sirotkin signed as test driver, the Formula One team announced on Saturday.
Lewis Hamilton boosted his morale with the fastest lap in Russian Grand Prix practice on Friday after Mercedes team mate Nico Rosberg set the early pace and Ferrari suffered reliability problems.
Stunned Mexican Sergio Perez said he put in the best laps of his Formula One career to get Force India back on the podium on Sunday.
Team by team analysis of Sunday's Russian Grand Prix (listed in championship order):
Formula One world champion Lewis Hamilton took pole position for the French Grand Prix on Saturday with Mercedes team mate Valtteri Bottas alongside him on the front row.
Lewis Hamilton led a Mercedes 1-2 at the top of the timesheets for the first free practice session at the season-opening Australian Grand Prix on Friday, while McLaren's hopes of a clean start were tempered by reliability issues.
Lewis Hamilton's lap of one minute 25.892 seconds is a track record at the Silverstone circuit.
Formula One championship leader Sebastian Vettel pumped in a stunning late lap to snatch pole position from team mate Kimi Raikkonen as Ferrari dominated Chinese Grand Prix qualifying on Saturday.
The Briton lapped the Albert Park circuit in a searing one minute and 21.164 seconds to cross the line 0.664 seconds clear of Ferrari's Kimi Raikkonen.
The German is 40 points adrift of Mercedes rival Lewis Hamilton with six races remaining and is running out of time to reassert himself in the battle of the four times world champions.
This year marks the first that two quadruple champions are competing in the same season and their battle to see who joins Argentine legend Juan Manuel Fangio in second place on the all-time list with five titles promises to light up the series.
Mercedes are expected to wrap up the constructors' championship on Sunday with three races to spare, having won 12 of the 15 so far with eight one-two finishes.
Sebastian Vettel handed Ferrari their first Canadian Grand Prix pole position since Michael Schumacher in 2001 on Saturday while Formula One championship leader Lewis Hamilton qualified fourth for Mercedes. Vettel, 14 points behind the Briton, will start from the front for the fourth time at the Circuit Gilles Villeneuve after setting a track record of one minute 10.764 seconds on a sunny afternoon.
Formula One's 'halo' head protection device makes its race debut this season in a 21-round championship with France and Germany back on the calendar and some new faces joining the old favourites on the starting grid.
Lewis Hamilton and Sebastian Vettel battle to match the late Argentine's 1950s feat of five world championships.
Formula One teams say they will race in Russia, despite the crisis in Ukraine and downing of a Malaysian airliner, unless the country's debut Grand Prix in October is called off or they are ordered not to go.