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Defending champion Novak Djokovic stormed into a sixth successive US Open semi-final last night with a 6-2, 7-6 , 6-4 demolition of 2009 winner Juan Martin Del Potro.
He goes on to face Spanish fourth seed David Ferrer who went a marathon 5-sets before beating Serb eighth seed Janko Tipsarevic.
Tomorrow's other semi-final sees third seed Andy Murray face Tomas Berdych of the Czech Republic.
Its ladies semi-finals day today with Serena Williams playing Sara Errani of Italy and Maria Sharapova taking on the world number one Victoria Azarenka.
