Cincinnati - World No 1 Naomi Osaka reached the quarter-finals of the WTA Cincinnati Masters on Thursday with a 7-6 (7/3), 5-7, 6-2 victory over Taiwan's Hsieh Su-wei.
Japanese second seed Osaka, current holder of the US and Australian Open titles, is playing the event for the fist time after failing to qualify on her only previous attempt in 2016.
Osaka needed two and a half hours to advance, defeating Hsieh for the third time in four meetings.
Results on Thursday at the WTA/ATP Cincinnati Masters (x-denotes seeding):
Men
Third round
Novak Djokovic (SRB x1) bt Pablo Carreño-Busta (ESP) 6-3, 6-4
Lucas Pouille (FRA) bt Karen Khachanov (RUS x8) 6-7 (3/7), 6-4, 6-2
Andrey Rublev (RUS) bt Roger Federer (SUI x3) 6-3, 6-4
Daniil Medvedev (RUS x9) bt Jan-Lennard Struff (GER) 6-2, 6-1
Roberto Bautista Agut (ESP x11) bt Miomir Kecmanovic (SRB) 6-1, 6-2
Richard Gasquet (FRA) bt Diego Schwartzman (ARG) 7-6 (8/6), 6-3
Yoshihito Nishioka (JPN) bt Alex De Minaur (AUS) 7-5, 6-4
David Goffin (BEL x16) bt Adrian Mannarino (FRA) 7-6 (8/6), 6-2
Women
Third round
Ashleigh Barty (AUS x1) bt Anett Kontaveit (EST) 4-6, 7-5, 7-5
Maria Sakkari (GRE) bt Aryna Sabalenka (BLR x9) 6-7 (4/7), 6-4, 6-4
Karolína Plíšková (CZE x3) bt Rebecca Peterson (SWE) 7-5, 6-4
Svetlana Kuznetsova (RUS) bt Sloane Stephens (USA x8) 6-1, 6-2
Venus Williams (USA) bt Donna Vekic (CRO) 2-6, 6-3, 6-3
Naomi Osaka (JPN x2) bt Hsieh Su-wei (TPE) 7-6 (7/3), 5-7, 6-2
Madison Keys (USA x16) bt Simona Halep (ROM x4) 6-1, 3-6, 7-5
Sofia Kenin (USA) bt Elina Svitolina (UKR x7) 6-3, 7-6 (7/3)