Roger Federer reckons that the US Open will be won by one of the world's top four players.

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Federer won his fourth Cincinnati title at the weekend but the draw was riddled with upsets with Rafael Nadal, Andy Murray and Novak Djokovic all making early exits. Instead, outsiders like Mardy Fish and Marcos Baghdatis reached the latter stages.

However over five sets at Flushing Meadows, Federer believes it will be all about the “big four.”

"I guess the top four have the best shot again, naturally," Federer said. "We can all play really well on the hardcourts. Murray has proven himself, so has Djokovic on the hardcourts and so has Rafa, he's won the Australian Open.  Maybe US Open is a bit faster, so you figure Rafa will struggle a bit more. But if the draw goes his way, he'll be in the finals and have a crack to the title, too. He knows how to win slams. He's won all the other ones."

The tournament is very open with Nadal still searching for his best form on the hard courts. Murray won the Toronto Masters but has yet to break his slam duck. Djokovic has not won a big tournament for some time and while Federer is a five time champion in New York he has been knocked out in the quarters of the past two majors.

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