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Ferrari, winners of six of the last seven grands prix, and Renault have taken all but one of the races this season with Honda's Jenson Button victorious in Hungary.
Briton Button and Brazilian team mate Rubens Barrichello both pose a threat at the Honda-owned circuit, with the team giving them a new development engine for the final two races.
McLaren's Kimi Raikkonen, superb last year when he roared through from 17th on the grid to overtake Renault's Giancarlo Fisichella on the last lap and claim a sensational victory, is another danger man.
The Finn, who replaces Schumacher at Ferrari next year while Alonso takes his place at McLaren, knows Suzuka represents probably his best remaining chance of success this year after a barren run since his 2005 triumph.
He can be sure that McLaren, desperate to prevent their first winless season in a decade and eager for Alonso to arrive as number one, will be pulling out all the stops on Sunday.