Baku — Lewis Hamilton has warned Ferrari to shape up and mount a serious title challenge after his Mercedes team swept the first four races of the season. The defending five-time world champion, who finished second behind his Mercedes teammate Valtteri Bottas in Sunday’s Azerbaijan Grand Prix, said the Italian team need to fight back hard to stay in contention to avert a similar Mercedes procession in May’s Spanish Grand Prix. “Until they start to perform at the level we are now, then this is how it’s going to be,” said Hamilton, who slipped a point behind championship leader Bottas on Sunday when Mercedes collected a record season-opening fourth straight one-two. “We definitely didn’t expect to have this level of performance, but I am glad we do. I think the team is outperforming itself. They’re going to have to pick it up if they want to fight us.” Ferrari’s four-time champion Sebastian Vettel finished third and his teammate Charles Leclerc fifth. “He is right,” said Vettel, who h...

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