Martin Whitmarsh concedes McLaren have cause for concern after neither driver made it into the top ten in Friday's practice in Melbourne. McLaren had a difficult time in pre-season testing and it was more of the same in Friday's first practice for this season. Jenson Button finished outside the top ten, 2.386s off the pace, while his new team-mate Sergio Perez was a further three-tenths adrift. "I think we should be worried about the pace," Whitmarsh told Sky Sports F1. "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, but certainly we are lacking pace. "I think we are still learning and...
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