Novak Djokovic (1), Serbia, def. Philipp Kohlschreiber, Germany, 6-4, 6-4, 6-4.
Stan Wawrinka (4), Switzerland, def. Joao Sousa, Portugal, 6-2, 7-5, 7-6 (3).
Kei Nishikori (5), Japan, def. Simone Bolelli, Italy, 6-3, 6-7 (4), 6-2, 3-6, 6-3.
Milos Raonic (7), Canada, def. Daniel Gimeno-Traver, Spain, 6-2, 6-3, 3-6, 7-6 (4).
Marin Cilic (9), Croatia, def. Hiroki Moriya, Japan, 6-3, 6-2, 7-6 (4).
Grigor Dimitrov (11), Bulgaria, def. Federico Delbonis, Argentina, 6-3, 6-0, 6-4.
Kevin Anderson (14), South Africa, def. Lucas Pouille, France, 6-2, 7-5, 3-6, 6-3.
David Goffin (16), Belgium, def. Horacio Zeballos, Argentina, 7-6 (4), 6-1, 6-1.
John Isner (17), United States, def. Go Soeda, Japan, 7-6 (5), 6-4, 6-4.
Tommy Robredo (19), Spain, lost to John Millman, Australia, 6-2, 6-3, 6-4.
Nick Kyrgios (26), Australia, def. Diego Schwartzman, Argentina, 6-0, 6-2, 7-6 (6).
Richard Gasquet (21), France, def. Luke Saville, Australia, 6-3, 6-2, 6-2.
Leonardo Mayer (24), Argentina, def. Thanasi Kokkinakis, Australia, 7-6 (7), 7-6 (3), 6-4.
Bernard Tomic (27), Australia, def. Jan-Lennard Struff, Germany, 6-3, 3-6, 2-6, 6-2, 6-3.
Pablo Cuevas (28), Uruguay, lost to Denis Kudla, United States, 6-7 (4), 4-6, 6-3, 6-2, 6-2.
Dominic Thiem (32), Austria, def. Dudi Sela, Israel, 2-6, 6-3, 6-4, 6-4.
Serena Williams (1), United States, def. Margarita Gasparyan, Russia, 6-4, 6-1.
Maria Sharapova (4), Russia, def. Johanna Konta, Britain, 6-2, 6-2.
Lucie Safarova (6), Czech Republic, def. Alison Riske, United States, 3-6, 7-5, 6-3.
Ana Ivanovic (7), Serbia, def. Xu Yi-Fan, China, 6-1, 6-1.
Carla Suarez Navarro (9), Spain, lost to Jelena Ostapenko, Latvia, 6-2, 6-0.
Karolina Pliskova (11), Czech Republic, def. Irina Falconi, United States, 6-4, 4-6, 6-1.
Andrea Petkovic (14), Germany, def. Shelby Rogers, United States, 6-0, 6-0.
Venus Williams (16), United States, def. Madison Brengle, United States, 6-0, 6-0.
Sara Errani (19), Italy, def. Francesca Schiavone, Italy, 6-2, 5-7, 6-1.
Sam Stosur (22), Australia, def. Danka Kovinic, Montenegro, 6-4, 6-4.
Victoria Azarenka (23), Belarus, def. Anett Kontaveit, Estonia, 6-2, 6-1.
Flavia Pennetta (24), Italy, lost to Zarina Diyas, Kazakhstan, 6-3, 2-6, 6-4.
Barbora Strycova (27), Czech Republic, lost to Sloane Stephens, United States, 6-4, 6-2.
Irina-Camelia Begu (29), Romania, def. Daria Gavrilova, Australia, 7-6 (6), 6-1.
Belinda Bencic (30), Switzerland, def. Tsvetana Pironkova, Bulgaria, 3-6, 6-1, 6-3.