iv> Sergio Perez has lost some confidence in the McLaren after spinning out of second practice for the Chinese Grand Prix. Perez had two accidents during Friday practice, one at the end of the morning session when he hit the barrier on the entry to the pit lane and one early in FP2 when he spun at turn eight. He said the second spin had been the more concerning one as he did not know what caused it. "It's been a very difficult day for myself with the crash in FP1 and then I went off in FP2," Perez said. "We don't really understand what happened in FP2, it was a big moment and I don't understand what really happened. "I was not pushing at that moment so I'm not very...
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