Robert Kubica is no longer in the picture, according to reports.

Russian racing driver Sergey Sirotkin is now the favourite to win the vacant seat at the Williams team in 2018, according to the latest reports from Williams has spent the last week evaluating data gathered during the Abu Dhabi Pirelli test, where it ran Sirotkin and Kubica.

Polish driver Kubica had been favourite to make a sensational return to F1, with Williams impressed by his feedback and the way he fitted into the team and built up strong relationships. However, it has emerged that based on pure performance, the data suggests Sirotkin is the stronger candidate. Williams has insisted throughout the process that its decision on the driver to partner Lance Stroll next season will be based on performance.

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Talks with the 22-year-old Russian, who has performed reserve duties for Renault this year, are now at an advanced stage. However, it is believed there are several details yet to be ironed out before the final contract is signed.

It is believed Sirotkin brings substantial backing with him, understood to be in the region of £15 million, from Russia’s SMP Racing, which was founded by Boris Rotenberg, who controls SMP Bank. Should the deal fall through, former Toro Rosso and Red Bull driver Daniil Kvyat is believed to be the back-up option.

However, it is understood that Kubica is no longer in contention for the race seat, ending his hopes of returning to the grid for the first time since 2010. has also been told that Williams reserve Paul di Resta, who stood in for the injured Felipe Massa in Hungary this year, is also out of the running. Williams is remaining tight-lipped and not making any official comment regarding its 2018 driver line-up.


Gallery: 2017 Williams F1 car