US Open Tennis on Twitter: "On this day in 🎾 history, Roger Federer (2003) & Novak Djokovic (2008) won the Tennis Masters Cup for the first time. They have combined to win
Whatever the numbers say, Federer's artistry was unrivalled | Reuters
James Blake: 'I was amazed by Roger Federer back in 2003 US Open'
Federer string setup 2003/2004 | Talk Tennis
Roger Federer's Dominance on the Court, In 16 Astonishing Images | Vogue
Roger Federer retires: Photos from tennis legend's memorable career - Sports Illustrated
Roger Federer | Biography, Championships, & Facts | Britannica