Sebastian Vettel's decision to leave Red Bull was influenced by the pace of his team-mate Daniel Ricciardo, team boss Christian Horner says. The German, who won four titles with Red Bull from 2010-14, has joined Ferrari after a year in which Ricciardo won three races and Vettel none. Horner says Ricciardo was 'probably a factor' in Vettel's decision. And he said the Australian's overtake of Vettel at the Italian GP was 'quite a defining moment for Sebastian'. Ricciardo dummied Vettel into the second chicane at Monza, feigning to pass one way before going the other, to beat him to fifth place in the race. Horner, speaking in an interview for the BBC F1 review show, said of Vettel: 'He was...
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