|The Princess Mundo Imperial|
Steve Johnson (7), United States, def. Gerardo Lopez Villasenor, Mexico, 7-5, 7-5.
Peter Gojowczyk, Germany, def. Federico Gaio, Italy, 5-7, 6-4, 6-2.
John Millman (8), Australia, def. Marcel Granollers, Spain, 6-3, 6-4.
Stan Wawrinka, Switzerland, def. Ryan Harrison, United States, 6-4, 7-6 (6).
Frances Tiafoe (6), United States, def. Jordan Thompson, Australia, 3-6, 6-4, 6-3.
Monica Puig, Puerto Rico, def. Maria Sakkari (6), Greece, 7-5, 4-6, 6-0.
Wang Yafan, China, def. Marie Bouzkova, Czech Republic, 6-2, 6-2.
Katie Boulter, Britain, def. Conny Perrin, Switzerland, 6-4, 7-5.
Beatriz Haddad Maia, Brazil, def. Irina Bara, Romania, 6-0, 6-2.
Donna Vekic (3), Croatia, def. Misaki Doi, Japan, 6-0, 6-3.
Feliciano Lopez and Marc Lopez, Spain, def. Marcus Daniell, New Zealand, and Wesley Koolhof, Netherlands, 6-4, 6-4.
Juan Sebastian Cabal and Robert Farah (3), Colombia, def. Nicolas Jarry, Chile, and Andreas Seppi, Italy, 7-6 (2), 6-3.
Alexander and Mischa Zverev, Germany, def. Nicholas Monroe, United States, and Miguel Angel Reyes-Varela, Mexico, 6-3, 7-5.
Cornelia Lister, Sweden, and Renata Voracova, Czech Republic, def. Timea Babos and Reka-Luca Jani, Hungary, 7-5, 7-5.
Johanna Konta, Britain, and Laura Siegemund, Germany, def. Daria Gavrilova and Astra Sharma, Australia, 6-4, 6-1.
Victoria Azarenka, Belarus, and Zheng Saisai, China, def. Alexa Guarachi, Chile, and Sabrina Santamaria (4), United States, 7-6 (3), 6-3.
Laura Pigossi, Brazil, and Wang Yafan, China, def. Marie Bouzkova, Czech Republic, and Renata Zarazua, Mexico, 6-4, 6-2.