McLaren on Friday admitted it is now "worried" about the pace of the new MP4-28 car. Jenson Button was just ninth in opening practice in Melbourne, before lagging more than two seconds off the pace in the second ninety minute session. Team newcomer Sergio Perez was consistently even slower. "I think we should be worried about the pace," team boss Martin Whitmarsh told British broadcaster Sky. "It is a tough day in the office for everyone at the moment, we are lacking grip and there is a lot of head scratching at the moment," he said. While most top teams - notably continuing pacesetters Red Bull - simply evolved their 2012 cars for the final season of V8...
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