World number one Novak Djokovic has insisted that he knows how to execute his game against upcoming opponent Marin Cilic at the US Open.
"[Cilic] hasn't lost a match, you know, 12, 13 matches in a row, so I'm sure that he feels confident," Djokovic told reporters. "He won today a really close match. A couple of five-setters he had already in this tournament, but he has a big serve.
"I think around 30 aces he had today, so the serve gets him out of trouble. I know him very well. I have played with him many, many times. We are great friends. Great guy. I know what to do and I'm hoping I can execute the game plan and play my best."
Djokovic won his first and only US Open title so far in 2011.