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

2011: Djokovic hits return heard 'round the world to beat Federer

Federer powers into U.S. Open quarter-finals, Tennis

Djokovic wins 1st match in Paris; now 38-0 in 2011 - The San Diego Union-Tribune

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

Novak Djokovic v Roger Federer: US Open history, Tennis News

I Should Be Doing the Other Press Conference' – Refusing to Accept US Open Defeat, Salty Roger Federer Once Went on a Wild Rant Against 'Lucky' Novak Djokovic - EssentiallySports

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

Wimbledon: Novak Djokovic and Roger Federer reach men's final

Djokovic eyes history with a 23rd Grand Slam title at the French Open

Djokovic battles past heat, sickness to advance at U.S. Open

Are You Kidding Me?'- A Frustrated Roger Federer Once Went All Salty Over His Humiliating Defeat to Novak Djokovic at The US Open - EssentiallySports