Kubica will depart F1 in a racing capacity after the Yas Marina race, with his astonishing return from life-threatening injuries having been played out to the backdrop of Williams' desperate under-performance.
And although Kubica has scored Williams' sole point of the season so far, at the chaotic German GP, he has qualified slower than rookie Russell at every event.
Russell will be joined at Williams by Nicholas Latifi in 2020.
Having beaten Kubica in qualifying in all 21 races this season, Russell's whitewash is the second in as many seasons in Formula 1.
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