Word has it that well heeled Russian driver Sergey Sirotkin is the new favourite for a 2018 Williams drive, with the potential Formula One return of Robert Kubica all but over.. Having gone up against each other in direct competition at the recent end of season Formula One tyre test, it looks like Williams have come to the decision that Polish former Grand Prix winner and Formula One returnee Robert Kubica doesn't quite have the speed seen in his first stint in Grand Prix racing, paving the way for Williams to preference the well financed Russian Renault test driver Sergey Sirotkin for a drive with the team next season. Sirotkin was something of a surprise choice for the Abu Dhabi test when confirmed by the British team early last month, and following his solid performance in the Pirelli test could well be in the prime seat for a drive with the team alongside Lance Stroll next year, potentially put to an end the fairy tale return of Kubica and Scottish test driver Paul di Resta. Maintaining the Russian link, according to Motorsport.com former Toro Rosso driver Daniil Kvyat has now moved into the running as first reserve option should Sirotkin fail to agree terms with the team in the next few weeks, with the Grove concern reportedly in advanced stages of negotiations with the 22 year old Formula Two driver. No doubt helping pave the way for Sirotkin at Williams is the reported £15m sponsorship package courtesy of long term backers SMP, meaning that Williams Grand Prix Engineering could well be looking at fielding not one but two pay drivers in 2018, marking something of a dramatic fall from grace for this once proud British outfit... If you like your motorsport fast and open wheeled, check out the Formula One sub forum and get yourself in on the discussion today! Like what you see here at RaceDepartment? Don't forget to like, subscribe and follow us on social media! RaceDepartment YouTube RaceDepartment Twitter RaceDepartment Facebook RaceDepartment Twitch RaceDepartment Instagram Do you think Sirotkin would be a good fit for Williams? Is this the end for Kubica in your opinion? Let us know in the comments section below!