Williams have narrowed the 2018 driver choice to three options, with Paul di Resta and Robert Kubica both set to receive test time ahead of a final decision later this year. With Williams obliged to have at least one driver over the age of 25 thanks to Martini sponsorship, the Grove based team are casting around for a full time partner alongside Lance Stroll next season, narrowing down the options to current incumbent Felipe Massa, test and reserve driver Paul di Resta or former race winner and fan favourite Robert Kubica, looking to continue on his comeback trail after finding himself left out in the cold following Renault's signing of Red Bull junior driver Carlos Sainz. With Williams needing to ideally make a decision before preseason testing begins next year, let us take a look at the options below: Felipe Massa Age: 36 Races: 267 Wins: 11 Poles: 16 Teams: Sauber, Ferrari, Williams Offering the least risk and already a known quantity at Williams, Massa is perhaps heading towards the sunset of an impressive career in Formula One and is generally acknowledged to be a solid, if not quite spectacular performer in his 36th year. Having performed reliably for Williams since stepping out of his short lived retirement, retaining Massa for another season in Formula One isn't a bad option for the British team, and he continues to be a solid and calming influence on his young rookie teammate. Paul di Resta Age: 31 Races: 59 Wins: 0 Poles: 0 Teams: Force India Having failed to really sparkle during his three year stint at Force India, Paul di Resta firmly put himself back in contention for a drive at Williams with a generally outstanding stand-in performance for the unwell Felipe Massa at Hungry earlier this year. With very little seat time in a modern Grand Prix car, di Resta performed admirably for the team and with his regular high level of performance in DTM continues to prove he is as sharp as ever in racing conditions. However does the Scottish driver really have a star quality to push Williams back toward the front of the Formula One grid? Robert Kubica Age: 32 Races: 76 Wins: 1 Poles: 1 Teams: BMW Sauber, Renault Easily the fan favourite of the three drivers thought to be in with a shout for next season, almost everyone connected to Formula One feels that the talented Polish driver still has unfinished business in Grand Prix racing. With the raw talent like Kubica undoubtedly had prior to his accident, and with Williams still not quite in a position to fight for top results on a regular basis, the general consensus remains that Kubica may well be a good bet for the marketing and fan reaction, and should his time away from Formula One or after effects of his major rally accident prove too big of an hurdle to overcome, the team could still replace the driver mid season with reserve di Resta. If however Kubica remains as competitive as he was in his Renault days, Williams could well be close to signing up one of the most talented drivers in current Grand Prix racing. So with three very respectable choices, and the prime remaining place on the 2018 F1 grid, who will Williams choose to lead the charge of this once dominant team, and can the Martini liveried outfit return to winning ways next season? For more from the world of Grand Prix racing check out our Formula One sub forum and get involved with the community today! Who would you like to see alongside Stroll at Williams next year? Let us know in the comments section below!