Senior editor Richard Pagliaro breaks down and predicts all four men's quarterfinals: (1) Novak Djokovic vs. (31) Florian Mayer—Head to Head: Djokovic leads 1-0 What Djokovic has to do to win: Impose his advantage in court positioning and big-match presence. Djokovic takes the ball earlier than Mayer; if he can hover on the baseline and rob the mechanical ball striker of response time, he can rush him into mistakes.