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South Africa's Kevin Anderson has opened with a 6 2 7 6 win over Finland's Jarkko Nieminen in the first round of the Shanghai Masters.
Bulgaria's Grigor Dimitrov set up a clash with Novak Djokovic by beating Pablo Andujar of Spain in straight sets.
The number one ranking is on the line at the Shanghai Masters.
Roger Federer can guarantee he remains as the top-ranked player by reaching the quarter-finals but anything less and Djokovic would overtake the Swiss by winning the Shanghai crown.
