BMW Sauber's Polish driver Robert Kubica drives at the Monza racetrack on Sunday.
Kubica, 23, took third place at the circuit where he took his first podium in 2006.
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With four races remaining, Hamilton has 78 points to Massa's 77 and Kubica is third with 64 for BMW-Sauber, pending an appeal into the result of the Belgian Grand Prix where the championship leader was demoted from first to third for cutting a chicane.