Context: Marin Čilić claimed his first grand slam title, defeating Kei Nishikori, also playing in his first major final.\n\nQuestion: who won the men's singles title of the us open tennis grand slam 2014? Let's give stream of consciousness first:
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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.
So, the final answer is Marin Čilić.
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