Roger Federer has claimed that it will take "something special" for an opponent to beat him in his current form.

The world number one will be attempting to win his sixth US Open title beginning this week and admits that he is full of confidence heading into the tournament in New York.

Federer said: "This time around I feel like if I'm playing well I can dictate who's going to win or lose.

"It's going to take something special from my opponent to win. That's kind of how it feels right now. Then again, I might walk away on Monday having lost in the first round.

"I will never ever underestimate an opponent ever again. I did that enough when I was a teenager. Those times are long gone."

Federer faces American Donald Young in the first round of the last major tournament of the year on Monday.