The 17-time Grand Slam champion has one of the smoothest and most accurate serves ... head speed). Federer bends his legs and shifts his energy into his quadriceps. 3. As the ball goes up, Federer ...

NEW YORK—For some in tennis, the serve clock was long awaited ... Svetlana Kuznetsova—yet their six sets took up five and a half hours. Andy Murray took three hours and 17 minutes to beat ...