Jenson Button topped the timesheets on the second of pre-season testing at Jerez, while world champion Sebastian Vettel's day ended prematurely.
Despite missing out on any action the previous day, Button came out firing in the offical wet-weather running on Wednesday morning, completing 43 laps in his MP4-29 and setting the fastest lap time in the early running.
The track was allowed to dry in the afternoon as the drivers switched tyres accordingly, allowing Button's former team-mate Sergio Perez to come to the fore - though the Mexican would break down on Turn 1 after completing a number of quick laps to bring out the red flag.
Earlier, Sauber's Esteban Gutierrez also caused the red flag...
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