US Open 2011: Roger Federer struggles to accept Novak Djokovic

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

U.S. Open Men's Final Preview: Novak Djokovic vs. Roger Federer

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

No. 1 Djokovic vs. No. 2 Nadal in US Open final - The San Diego Union-Tribune

Novak Djokovic - Wikiwand

Sport, Us/sport

Djokovic beats Nadal to win US Open - Taipei Times

Roger Federer beats Novak Djokovic in Dubai Championship semi-finals - ABC News

Roger Federers tennissäsong 2011 – Wikipedia

Which are the most devastating losses in careers of Federer, Nadal and Djokovic? - Quora