The Swiss tennis star Roger Federer believes any one of the top four players in the world can win the US Open which starts in New York next week.
Federer's warmed up for the last Grand Slam of the year with a win at the Cincinnati Masters, the 63rd title of his career.
Now Federer believes he has turned a corner and couldn't be happier as he heads toward the Open where he will seek his 17th grand slam crown and sixth at Flushing Meadows.
Federer, the world number two, believes the title is wide open.
