The world number one eventually progressed to the final after a five-set battle with the Argentinian, which was the longest semi-final in Wimbledon history.
"It was one of the best matches I have been involved with. One of the most exciting, definitely," BBC Sport quotes the Serbian as saying.
"I could not separate us, apart from when I was 2-1 and a break up, and I dropped serve. That's why he's a Grand Slam champion. He came up with some top shots, credit to him."