Taylor Fritz (US) beat Grigor Dimitrov (Bul) 6-2 6-7 (11-13) 6-1
Iga Swiatek (Pol) beat Madison Keys (US) 6-1 6-3
Alexander Zverev (Ger) beat Nuno Borges (Por) 6-2 7-5
Stefanos Tsitsipas (Gre) versus Alex de Minaur (Aus)
Coco Gauff (US) versus Qinwen Zheng (Chn)
Alejandro Tabilo (Chi) beat Karen Khachanov 7-6 (7-5) 7-6 (12-10)
Zhizhen Zhang (Chn) beat Thiago Monteiro (Brz) 7-6 (7-4) 6-3
Nicolas Jarry (Chi) beat Alexandre Muller (Fra) 7-5 6-3
Tommy Paul (US) versus Daniil Medvedev 6-1 0-1
Marcel Granollers (Spa) & Horacio Zeballos (Arg) beat Rafael Matos (Brz) & Andres Molteni (Arg) 6-4 6-2
Simone Bolelli (Ita) & Andrea Vavassori (Ita) beat Rohan Bopanna (Ind) & Matthew Ebden (Aus) 6-2 6-4
Caroline Dolehide (US) & Desirae Krawczyk (US) beat Giuliana Olmos (Mex) & Alexandra Panova 6-3 7-5
Sara Errani (Ita) & Jasmine Paolini (Ita) beat Lyudmyla Kichenok (Ukr) & Jelena Ostapenko (Lat) 6-3 5-7 10-5
Sebastian Baez (Arg) versus Hubert Hurkacz (Pol) 7-5 6-7 (4-7) 2-1