Kubica completes Williams evaluation in Hungary

Williams has confirmed Robert Kubica has completed a "productive day" of testing for the team at the Hungaroring as it evaluates the Pole for a potential race seat in 2018.

Kubica carried out what was described as a "successful day" of running at Silverstone last week in the team's 2014 car, to familiarize himself with the FW36. That test has been followed by a two-day evaluation also featuring Paul di Resta at the Hungaroring, again in the 2014 car.

Holding the two-day test in Hungary allows Williams to compare the two drivers back-to-back, with Kubica having also already tested a 2017 car for Renault at the venue back in July. Di Resta is being used having raced for Williams in this year's Hungarian Grand Prix, filling in for the unwell Felipe Massa at short notice.

After Tuesday's running, a Williams spokesperson confirmed: "Robert Kubica has completed another productive day running with the team today at the Hungaroring, driving the 2014 FW36. Paul di Resta is due in the car tomorrow.

"We will not release any further information regarding the tests as we continue our evaluations."

Kubica is in the frame to replace Massa at Williams in 2018, with any hopes of a move to Renault ending when Carlos Sainz was signed to replace Jolyon Palmer. Kubica is believed to be the front-runner for the seat if he can convince Williams he would not be limited by the injuries suffered in a rally crash in early 2011.

Massa is expected to stay with Williams if Kubica does not get the seat, with di Resta only having an outside chance of replacing the Brazilian after his one-off appearance this season.

Lance Stroll is already contracted to the team for 2018, and Pascal Wehrlein has also been linked with a seat, though such a deal may require some additional planning when it comes to title sponsor Martini using the drivers for marketing purposes.