Output a stream of consciousness before answering the following. Context: Marin Čilić claimed his first grand slam title, defeating Kei Nishikori, also playing in his first major final.

Question: who won the men's singles title of the us open tennis grand slam 2014?
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The relevant information to answer the above question is: Marin Čilić claimed his first grand slam title, defeating Kei Nishikori, also playing in his first major final.
The answer: Marin Čilić.
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