[IMG]http://d.yimg.com/a/p/afp/20100416/capt.p***o_1271441788292-3-0.jpg?x=130&y=84&q=85&sig=8pxJcKRu0kBFgrk7ilLT7Q--[/IMG]AFP - Lewis Hamilton was cautious about his chances of victory in Sunday's Chinese Grand Prix after topping the times for McLaren in Friday's dramatic free practice sessions.




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