1. The superstars
This year, Serena Williams will be competing for her seventh U.S. Open title, which would beat the six-win record she shares with the legendary Chris Evert (though Molla Bjurstedt Mallory of the pre–Open era beats out everyone with eight victories in the 1910s and ‘20s). Who will be Serena’s main opponent this year: Could it be Caroline Wozniacki once again or perhaps Maria Sharapova? And could there be the kind of underdog uprising that Marin Čilić had last year, or will stalwarts like Roger Federer and Novak Djokovic reclaim their reigns?