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

Federer dazzles on Day 3 of World Tour Finals - Sports Illustrated

Generation game: The kids threatening Roger Federer, Novak Djokovic, Andy Murray and Rafael Nadal at the top of tennis, The Independent

Djokovic ready for clay - Eurosport

Novak Djokovic stuns Roger Federer in US Open semi-final, Roger Federer

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

Coco Gauff's coach makes 'insane' Novak Djokovic US Open admission, Tennis, Sport

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

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

Novak Djokovic defeats Roger Federer in Italian Open final - Los Angeles Times

French Open Tennis 2011: 10 Reasons Why Roger Federer Won't Bounce Back, News, Scores, Highlights, Stats, and Rumors