Getty Images Enlarge Felipe Massa showed the first tangible proof of Williams' potential this year by topping the times on the opening day of the final pre-season test in Barcelona. Meanwhile, McLaren experienced yet more problems with its Honda power unite and Mercedes also suffered a rare reliability issue. Mercedes' Lewis Hamilton posted a 1:24.861 on medium tyres early in the day before rain prevented lower lap times being set ahead of the lunch break. His position at the top of the leaderboard did not last long when the sun came out in the afternoon, however, as Massa went top by 1.381s on soft tyres to post the quickest time of testing so far. Massa went on to clock 103 laps while...
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