JEREZ, Spain (Reuters) - Renault rushed to fix a problem with their new Formula One power unit on Wednesday after Red Bull's world champion Sebastian Vettel wrapped up his first pre-season test early with barely any laps completed.
While the three Renault-powered teams testing in Jerez struggled to put laps on the board, German driver Nico Rosberg completed an impressive 97 in his Mercedes - including one unbroken 24-lap stint.
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