It's been five years since Kei Nishikori upset Novak Djokovic in the semifinals of the U.S. Open to secure his first, and so far only, appearance in a Grand Slam final.
At the time it was seen as a stroke of luck that Roger Federer, having been upset himself by Marin Cilic, wasn't awaiting him in the championship match.
But Nishikori failed to take advantage, falling to an on-fire Cilic in straight sets.
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