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Max Verstappen led a Red Bull one-two in an unrepresentative first practice session at the Turkish Grand Prix on a low-grip track.

Verstappen's team-mate Alexander Albon was second, ahead of Ferrari's Charles Leclerc and Pierre Gasly's Alpha Tauri.

The Istanbul Park circuit, holding its first race since 2011, was resurfaced two weeks ago and drivers were more than 10 seconds off the pace expected.

Mercedes' Lewis Hamilton was 15th and team-mate Valtteri Bottas ninth.

Briton Hamilton will be champion as long as he does not lose more than seven points to Bottas.

With Mercedes expected to lead the way, that effectively means the 35-year-old will clinch the title if he wins the race, or if he finishes second to Bottas as long as the Finn does not also set fastest lap.

Hamilton, who can clinch a record-equalling seventh world title on Sunday, was more than five seconds off the pace.

Verstappen was 0.241secs quicker than Albon, who was 0.189secs faster than Leclerc.

There were a number of spins throughout the session as drivers struggled with the low-grip surface, with Bottas, Verstappen and Gasly joined by Alpha Tauri's Daniil Kvyat and Williams' Nicholas Latifi.

And the session was briefly red-flagged early on when Leclerc slid wide and knocked over the bollard marking the entry to the pit lane.

It was a tough session for McLaren's Carlos Sainz, who was called into the pits with an engine problem.

The team said they had found an electrical issue and sent him out again, only for the Spaniard to stop on track saying the problem was "engine, power steering".

Williams driver George Russell is to start from the back of the grid as a penalty for using more than the permitted number of engine parts this season, after exceeding his allocation of internal combustion engines, turbos and MGU-Hs, the hybrid device that recovers energy from the turbo.