In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Among the entities, try to find the best entity that is most likely to fill in "_" and classify the answers based on options.
Q: (CNN) -- Grigor Dimitrov and Milos Raonic have often been talked about this year as being part of the next generation of players who can break up the dominance of tennis' Big Four. But judging by his display at the U.S. Open, Marin Cilic could be the most likely candidate. Cilic became only the third men's player outside Roger Federer, Rafael Nadal, Novak Djokovic and Andy Murray to win a grand slam title since early 2005 when he crushed Kei Nishikori 6-3 6-3 6-3 in under two hours in New York on Monday. Few, however, would have seen it coming -- last year the 25-year-old Croatian didn't play at the season's final major because he was serving a drug suspension.Marin Cilic defeats Kei Nishikori in New York to claim his first majorCilic and Nishikori were each playing in their first grand slam finalA year ago Cilic didn't play at the U.S. Open as he served a drug banNishikori was trying to become the first Asian man to win a major 
 Questions:He showed his frustration at 2-4 after he struck a short ball that allowed _ to pounce with a forehand. (A) CNN (B) Grigor Dimitrov (C) Milos Raonic (D) Big Four (E) U.S. Open (F) Marin Cilic (G) Roger Federer (H) Rafael Nadal (I) Novak Djokovic (J) Andy Murray (K) Kei Nishikori (L) New York (M) Croatian (N) Nishikori (O) Asian
A: 
(F)