Hamilton key to 2019 driver market, says Horner

Of the top three teams' drivers, only Ferrari's Sebastian Vettel and Red Bull's Max Verstappen have deals that run past 2018 - with championship leader Mercedes yet to confirm either Hamilton or teammate Valtteri Bottas for next year.Red Bull is working on an extension for Verstappen's teammate Daniel Ricciardo, but also retains Carlos Sainz under contract - and could call him back to ... Keep reading