Sport: the best pictures from the last 24 hours

A Swiss athlete tests his tricycle in front of the Bird's Nest stadium in Beijing ahead of the Paralympic Games Photograph: Andy Wong/AP

Vijay Singh celebrates going up in the world after victory in the Deutsche Bank Championship in Norton, US, pushed him up the world rankings to third Photograph: Stew Milne/AP

A pumped-up Serena Williams celebrates defeating Severine Bremond in the US Open. Serena will meet her sister Venus in the quarter-finals Photograph: Shaun Best /Reuters

The peleton gets a little crowded as riders take on the third stage of the Tour of Spain, the 'La Vuelta', from Jaen to Cordoba Photograph: Dani Cardona/Reuters

Frenchman Gael Monfils slips up during his fourth-round match against home favourite Mardy Fish. The American won in straight sets Photograph: Elise Amendola/AP

Belgian cyclist Tom Boonen, wearing a fetching Cordovan hat, celebrates winning the third stage of the Tour of Spain Photograph: Diego Tuson/AFP

Two disabled swimmers prepare for the forthcoming Paralympic Games Photograph: Frederic Brown/AFP

There are smiles all round as Manchester United's new signing Dimitar Berbatov poses with Sir Alex Ferguson Photograph: John Peters/Getty