Rafael Nadal (right) will play his first match as world number one at the US Open on Monday after toppling Roger Federer

World number four David Ferrer, who is in Andy Murray's quarter of the draw, is in action early on day one and wins easily

Frenchman Gael Monfils also wastes no time reaching the second round - for only the second time in his career

Olympic champion Elena Dementieva is relieved to come through her opening match, despite a scrappy display

Nadal gets his campaign under way with a surprisingly tough encounter against Bjorn Phau of Germany

And Murray is also in action on day one as he takes on Argentina's Sergio Roitman on Louis Armstrong Court

Lindsay Davenport, the 1998 champion and crowd favourite, enjoys an easy win in what she has hinted could be her last US Open

The most dangerous moment for Murray comes when he tries to avoid a Roitman serve and gets hit in the back

But Murray recovers from that blow to wrap up a 6-3 6-4 6-0 victory in one hour 35 minutes

Nadal is mighty relieved to finally see off Phau 7-6 (7-4) 6-3 7-6 (7-4) in almost three hours

Four-time defending champion Roger Federer makes an appearance on his day off as the opening ceremonies take place ahead of the night session

And Maria Sharapova is also in town despite being sidelined by a serious shoulder injury