Ferrer bewildered after win

Clay court specialist David Ferrer was struggling to explain his success on hard courts after reaching the semi-final of the US Open with a straight-sets win over Juan Ignacio Chela in New York.

Ferrer booked his place in the last four, the furthest he has progressed in a grand slam, with a 6-2 6-3 7-5 win over the Argentinian 20th seed at Flushing Meadows.