If you don’t have the flame burning in you, you just cannot compete at this level. [Serena and Roger] express it in different ways, but it’s still burning for both of them. And though it’s harder for me to speak about Roger than Serena, they both must feel capable of still winning Grand Slams. Otherwise they wouldn’t still be out here. Of that much I am certain.

Patrick Mouratoglou, who is Serena Williams’ tennis coach, commenting to The New York Times this week for its report, “At the French Open, Serena Williams Wins While Roger Federer Waits.”