Formula 1 testing: Winners and losers from the first test in Jerez
BBC F1 commentator Ben Edwards gives his thoughts on the winners and losers from the first Formula 1 winter test, from Jerez in Spain.
On Friday's final day of testing, Mercedes, Ferrari and Williams looked impressive while Red Bull and other Renault-powered cars struggled.
The second pre-season test takes place in Bahrain from 19-22 February.
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