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

Australian Open 2012: Federer vs Nadal, What Each Star Must Do to Win, News, Scores, Highlights, Stats, and Rumors

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

2011 U.S. Open: Federer Is Set to Battle Djokovic in Semifinals - The New York Times

Novak Djokovic vs Roger Federer - US Open 2011 Semifinal: HD Highlights

Djokovic wins 1st match in Paris, 40th in a row

The Impossibile Comeback of Novak Djokovic against Roger Federer - Us Open 2011 SF

Rafael Nadal withdraws from U.S. Open with ongoing knee injury - Sports Illustrated

French Open 2011: Roger Federer destroys Novak Djokovic's run of victories to surge into final

At the U.S. Open, Novak Djokovic Struggles to Close - WSJ

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

If Djokovic defeated Federer (and Nadal) at the 2011 French Open, could he have defeated Nadal in upcoming seasons there? - Quora

Novak Djokovic stands alone

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

Novak Djokovic Reveals How He Outsmarted Roger Federer to Save 2 Match Points in 2011 US Open Semifinal - The SportsRush