At the 2005 French Open, Roger Federer congratulated Rafael Nadal after their semifinal. Now Federer is congratulating Nadal on his looming retirement — and a stellar pro career.

Roger Federer retires from tennis with grace and modesty in 'Federer: Twelve Final Days,' a documentary directed by Asif Kapadia and Joe Sabia.

Tennis great Roger Federer won 20 grand slam titles -- and at 41, he announced his retirement. NPR's A Martinez talks to the co-directors of the documentary "Twelve Final Days" about Roger Federer.

Roger Federer retired from tennis at 41 having achieved everything there was to conquer: 20 Grand Slam titles and a reputation so sterling that his home country of Switzerland minted his face on ...