Andy Murray (3), Britain, def. Santiago Giraldo (27), Colombia, 6-3, 6-4.
Kevin Anderson (15), South Africa, def. Leonardo Mayer (24), Argentina, 6-4, 6-4.
Adrian Mannarino (28), France, def. Stan Wawrinka (7), Switzerland, 7-6 (4), 7-6 (5).
Dominic Thiem, Austria, def. Jack Sock, United States, 6-4, 6-3.
Gael Monfils (17), France, def. Jo-Wilfried Tsonga (11), France, 6-4, 7-6 (4).
Fernando Verdasco (29), Spain, def. Rafael Nadal (2), Spain, 6-4, 2-6, 6-3.
Simona Halep (3), Romania, def. Camila Giorgi (30), Italy, 6-4, 7-5.
Svetlana Kuznetsova (24), Russia, def. Angelique Kerber (13), Germany, 6-3, 3-6, 6-3.
Flavia Pennetta (15), Italy, def. Victoria Azarenka, Belarus, 7-6 (5), 7-6 (6).
Serena Williams (1), United States, def. CiCi Bellis, United States, 6-1, 6-1.
Sara Errani (11), Italy, def. Garbine Muguruza (21), Spain, 4-6, 6-4, 6-1.
Belinda Bencic, Switzerland, def. Tatjana Maria, Germany, 6-4, 7-5.
Sloane Stephens, United States, def. Johanna Larsson, Sweden, 6-4, 6-4.
Thomaz Bellucci and Joao Souza, Brazil, def. Marcel Granollers and Marc Lopez, Spain, 2-1, retired.
Marcelo Melo and Bruno Soares (3), Brazil, def. Santiago Giraldo, Colombia, and Martin Klizan, Slovakia, 7-5, 6-3.
Vasek Pospisil, Canada, and Jack Sock (2), United States, def. Leonardo Mayer, Argentina, and Gilles Muller, Luxembourg, 6-2, 6-4.
John Isner and Sam Querrey, United States, def. Andre Begemann, Germany, and Ernests Gulbis, Latvia, 6-2, 7-6 (4).
Timea Babos, Hungary, and Kristina Mladenovic (7), France, def. Alla Kudryavtseva and Anastasia Pavlyuchenkova, Russia, 6-1, 6-3.
Ekaterina Makarova and Elena Vesnina (2), Russia, def. Daniela Hantuchova, Slovakia, and Karin Knapp, Italy, 6-2, 6-2.
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