• Novak Djokovic beat John Millman and has advanced to the semifinals in his last 11 U.S. Open appearances.
• Madison Keys, last year’s U.S. Open runner-up, booked a return trip to the semifinals, where she will face Naomi Osaka, a 20-year-old from Japan.
• Kei Nishikori joined his Japanese countrywoman in the semifinals by defeating Marin Cilic in five sets.
• Scores and schedule: Men | Women
Here’s what happened Wednesday at the U.