Novak Djokovic has beaten Stanislas Wawrinka in straight sets to reach the Cincinnati Open semi-finals for the fifth time.
The world number one will face either Tomas Berdych or Alexandr Dolgopolov for a place in the final.
There was little to separate the two players during a cagey opening set, but Djokovic was able to break at 4-4 before serving it out 6-4.
Wawrinka faded dramatically in the second, allowing Djokovic to capitalise and take a commanding 4-0 lead. From there the Serbian had little trouble sealing a 6-4 6-1 win with just over an hour on the clock.
The event in Cincinnati is the only Masters 1000 title that Djokovic has failed to win during his career.
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