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.
Russian Grand Prix winner Lewis Hamilton might cover the distance in a matter of minutes but it has taken more than half a century for Mercedes to add their names to the likes of Ferrari, McLaren and Williams.
Britain's Lewis Hamilton won a wet and sombre Japanese Grand Prix on Sunday to extend his Formula One lead over Mercedes team mate Nico Rosberg to 10 points with four races remaining.
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.
Red Bull designer Adrian Newey went back to his drawing board on Thursday after another nightmare day for the Formula One champions in pre-season testing in southern Spain.
Formula One drivers have backed proposals to introduce a 'virtual safety car' or automatic speed limiter that would force the entire field to slow when yellow warning flags are waved.
However intense the pain felt by Formula One after Jules Bianchi's horrific accident in Japan, and the shock is deep indeed, Friday's inaugural Russian Grand Prix practice offers some respite.
Lewis Hamilton took his fourth pole position in a row for Mercedes on Saturday after a rain-hit qualifying session at the Belgian Formula One Grand Prix.
Formula One supremo Bernie Ecclestone could have 22 races jostling for a slot next season but teams have made clear they want the calendar limited to 20.
Red Bull's quadruple World champion Sebastian Vettel seized pole position on Saturday for a US Grand Prix that could see him celebrate a record eighth successive win of the Formula One season.