Isner to fight uphill battle against Federer

American hopeful John Isner will try to replicate his achievement of beating Roger Federer once again as he prepares for their fourth round match on Monday at the US Open in New York City.

Having last beaten the Swiss maestro in 2012 during a Davis Cup rubber, Isner admitted that it was probably his most memorable victory against Federer and that he hopes that he will have similar luck when the two meet for the sixth time on Monday.

"I'm going to go out there and roll the dice," the 30-year-old told

"That was the best win of my career and one of the best matches I've ever played, hands down. I played extremely well that day and I needed to beat him. I’m going to need to do that again on Monday."

As the US Open progressed, Isner states that he has plenty more to give and that he will have to play at his peak if he is to salvage anything from their match.

"Definitely conserved a lot of energy. I’ll be able to leave it all out there on Monday, win or lose," he added.

"I have been on and off the court pretty quickly my first three matches. That bodes well for me. Same goes for him, but he’s generally in that position."

In admiration for the 17-time grand slam champion, the American said that despite Federer’s aging body he still manages to compete with his much younger rivals and that facing him is one of the greatest honours a player can hope for.

However, the current world number 13 also said that he is going into their match with a winning mentality.

"As he gets older he seems to keep getting better," Isner added.

"It's unbelievably impressive what he’s continuing to do. He is playing at a very high level right now. I have the utmost respect for him. At the same time, I feel like I can challenge him on Monday.

"It's what I work so hard for, to get an opportunity like this. I’m going to have fun with it. At the same time, I’m going to go out there and believe that I can win."