The winner of twenty Grand Slam titles and the top-ranked men’s player for three hundred and ten weeks, Roger Federer remains a dominant force in tennis. On the eve of playing in his nineteenth U.S. Open, Federer spoke with David Remnick about how he got over the hot temper and predilection for throwing racquets that he showed early in his career. At the advanced age of thirty-eight—and as a father of young children—Federer explains what he’s had to give up in order to keep playing professionally. But he doesn’t plan to retire a day before he has to. “I think it's nice to keep on playing, and really squeeze the last drop of lemon out of it,” he tells Remnick, “and not leave the game of tennis thinking, Oh, I should have stayed longer.” Plus, the staff writer Hua Hsu on the singular career of a Chinese vocalist with global ambitions.