F1 Testing: First in-season test of 2018 taking place at Barcelona

Lewis Hamilton, Sebastian Vettel and Max Verstappen are among the drivers in action at Barcelona on Tuesday for the first of two days of testing following last weekend’s Spanish GP.

Tuesday is the first of only four days of track running with 2018 cars that teams get to test outside of race weekends during the season, and therefore represents a key chance for them to improve their cars and test fresh development parts.

Spanish GP podium finishers Hamilton and Verstappen are in action for Mercedes and Red Bull respectively, while Vettel is driving for Ferrari as the Scuderia attempt to understand the reasons for their sudden Spanish GP struggle.

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F1 rules dictate that two of the four in-season test days must be given over to drivers with fewer than three grand prix starts and so this week’s line-up at the Circuit de Catalunya features a mix of youth and experience.

Hamilton, Vettel and Verstappen are joined by fellow race drivers Romain Grosjean (Haas), Carlos Sainz (Renault) and Stoffel Vandoorne (McLaren) on day one.

Barcelona Test driver line-ups Tuesday, May 15 Wednesday, May 16 Mercedes Lewis Hamilton Valtteri Bottas Ferrari Sebastian Vettel Antonio Giovinazzi Red Bull Max Verstappen Jake Dennis Renault Carlos Sainz Jack Aitken McLaren Stoffel Vandoorne Lando Norris McLaren Pirelli tyre test Lando Norris/Oliver Turvey Stoffel Vandoorne Haas Romain Grosjean TBC Force India Nicholas Latifi Nikita Mazepin Force India Pirelli tyre test George Russell Nicholas Latifi Toro Rosso Sean Gelael Pierre Gasly Sauber Antonio Giovinazzi Charles Leclerc Williams Oliver Rowland Robert Kubica

McLaren and Force India are the only teams permitted to field two cars, with one apiece specifically being used for Pirelli tyre testing.

Mercedes junior and F2 front-runner George Russell is carrying out this role for Force India, with fellow Britons Lando Norris and Oliver Turvey sharing the same tyre duties in the second McLaren.

Oliver Rowland’s debut for Williams means there are five British drivers in the Tuesday field. Another two, Red Bull simulator driver Jake Dennis and British-Korean Jack Aitken for Renault, make their debuts on day two.

Ahead of the Spanish Grand Prix, watch Martin Brundle's alternative gridwalk on the city street of Barcelona

The test runs between 8am and 5pm UK time with an hour’s break for lunch.

Teams have already completed eight days of winter testing at the Circuit de Catalunya this year during February and March. The second in-season test takes place at the Hungaroring following the Hungarian GP in late July immediately before F1’s summer break.

See the final word on all the Spanish GP action and latest F1 talking points on the next edition of the F1 Report! Make a date with Sky Sports F1 on Wednesday at 8.30pm when the guests are former Ferrari and McLaren engineer Pat Fry and technical analyst Craig Scarborough Get Sky Sports F1.