(CNN) -- Novak Djokovic has beaten Juan Martin Del Potro 6-3 6-2 in Saturday's Cincinnati Masters semi final to continue his fine run of form in the build up to the U.S. Open. The semi final in Ohio represented a rematch of the bronze medal match at the London Olympics, which Del Potro won. The Serbian will face world number one Roger Federer in the final after he ran out 7-6 6-3 over his fellow Swiss Stanislas Wawrinka. Djokovic, who has lost in the final at Cincinnati three times before, always looked comfortable against Del Potro, with the Serbian showing the form that helped him win the U.S. Open in 2011.
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Novak Djokovic topples Juan Martin Del Potro in first semi final
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World number one Roger Federer overcomes Stanislas Wawrinka
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Del Potro struggles with wrist injury
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Djokovic looking to overturn losing final record at Cincinnati
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