US Open 2011: Roger Federer struggles to accept Novak Djokovic defeat, US Open 2011

Roger Federer was left stung by Novak Djokovic's comeback in their five-set US Open semi-final

Roger Federer makes quick work of Juan Monaco at US Open

The Top Five Wins For Roger Federer Over Novak Djokovic - World Tennis Magazine

Fired-up Federer survives

Djokovic ready for clay - Eurosport

Roger Federer: You can't always win, spc talk

To Lose Against Someone Like That Is Disappointing: When Roger Federer Was Infuriated by Novak Djokovic at US Open - The SportsRush

Roger Federer shocks French Open by beating Novak Djokovic, French Open 2011

Novak Djokovic reveals key to iconic 2011 US Open return against Roger Federer

French Open 2011: Rafael Nadal Beats Roger Federer In Roland Garros Yet Again - SB Nation Bay Area

16 Facts About Roger Federer

About Roger Federer - International

How did Roger Federer become the richest tennis player in the world – and how does he spend his millions?

Roger Federer's big matches: A look at 10 Grand Slam finals – KXAN Austin

Roger Federer says he's 'definitely done' with professional tennis