Semi-final draw blown wide open with stunning upset in final eight.
In one of the upsets of the tournament to date, Stanislas Wawrinka has beaten Andy Murray in straight sets in the US Open quarter-finals.
While Murray was by no means assured of a place in the final four, nobody expected him to be sent packing in just three sets.
Wawrinka came out of the blocks firing ans never let up as the frustration for Murray set in as his opoonent won 6-4, 6-3, 6-2.
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