Jenson Button has joined the list of those billing Williams and Mercedes as this season's early favourites but warned against writing off Red Bull.
Williams left the final Bahrain test at the top of the timesheets with Felipe Massa setting the fastest time at the Sakhir circuit by 0.020s ahead of Lewis Hamilton.
His Williams team-mate Valtteri Bottas topped the table for the most laps completed ahead of Sergio Perez and Massa.
The Grove-based team's showing has led several to predict that along with Mercedes they will enter this year's Championship as the early favorites.
In an interview with Sky Sports News Button gave his opinion, saying: "It has been a messy winter for a lot of...
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