Sebastian Vettel admits he isn't currently driving at his best, conceding that he's still struggling to come to grips with the "unnatural" behavior of Ferrari's SF90. The Scuderia's 2019 contender exited winter testing as the outright favorite at the start of the season but the Italian outfit has yet to confirm its pre-season form while Vettel himself has often been outpaced by new recruit Charles Leclerc. Circumstances have put the German ahead of his team mate in the championship but Vettel insists he needs to step up his performance, as does his team, to challenge his Mercedes counter-parts. Leclerc: 'I will do anything to change the hierarchy at Ferrari' "We need...
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