Sydney International: Agnieszka Radwanska ousts Johanna Konta; Angelique Kerber labours past Venus Williams
Radwanska raced to a 6-3, 7-5 victory over Johanna Konta while second seed Williams was beaten 5-7, 6-3, 6-1 by Germany’s Angelique Kerber in under two hours.
Caroline Wozniacki survived an early scare to join Julia Goerges in the WTA Auckland Classic final after an exhausting Saturday involving the quarter and semi-finals.
Wozniacki took less than an hour to dismiss Petra Martic 6-2, 6-2 with only a slight blip when she dropped her serve at the start of the second set.
Auckland Classic: Caroline Wozniacki cruises into second round, defending champion Lauren Davis crashes out
There were no problems for Wozniacki after the Dane recovered from a rough start to romp home 6-3, 6-0 against American Madison Brengle.
"Venus is someone I've respected and admired," said Osaka, who was not born when Williams reached her first Grand Slam final at the 1997 US Open.
Hong Kong Open: Venus Williams shakes off rust with easy win; Elina Svitolina, Caroline Wozniacki progress
Venus Williams took just 74 minutes to see off Japan's Ozaki in hot and humid conditions in Victoria Park.
China Open: Rafael Nadal through to quarter-finals; Caroline Wozniacki, Karolina Pliskova knocked out
Rafael Nadal saw off the young Russian Karen Khachanov 6-3, 6-3 to set up a clash with John Isner in Beijing.
China Open: Simona Halep picks up first win over Maria Sharapova to enter quarters; Nick Kyrgios advances too
The world number two, Halep was an emphatic 6-2, 6-2 winner to leave five-time Grand Slam champion Sharapova still searching for her first title since returning from a doping ban in April.
China Open: Petra Kvitova sets up Caroline Wozniacki showdown; Karolina Pliskova advances to Round 3
No 12 seed Kvitova holds a 6-5 lead in her head-to-head record with Wozniacki, having won their last two matches in straight sets.
Svitolina, chasing her sixth title of the season, survived three break points in third game of the opening set before breaking her opponent’s serve to claim the set.
Barty, who began 2017 ranked outside the top 300, will face Caroline Garcia in her first Premier 5 tournament final after the French player toppled Greece's Maria Sakkari 6-3, 6-2 in a one-way semi-final.
Ostapenko won the last six games of a compelling match against Muguruza, scoring her first win over a reigning World No 1 and extending her winning streak to eight in a row.
Wuhan Open: Garbine Muguruza survives Magda Linette scare, sets up quarter-final against Jelena Ostapenko
Muguruza dominated the first set, but performed meekly in the second at a hot and humid tournament that has seen all but three seeds crash out.
Wuhan Open: Agnieszka Radwanska points to exhaustion as reason behind early exit of top female players
Radwanska crashed out of the hot and sticky tournament at the hands of Australia's Ashleigh Barty after struggling to overcome a virus that had forced her out of the Pan Pacific Open in Tokyo.
Simona Halep was defeated 6-2, 6-1 by Daria Kasatkina on Tuesday at a tumultuous Wuhan Open that has seen two-thirds of the top seeds tumble out in the first two rounds.
Wuhan Open: Peng Shuai ousts defending champ Petra Kvitova; Johanna Konta, Sloane Stephens knocked out
Petra Kvitova's bid for a third Wuhan Open title ended at the hands of Chinese No 1 Peng Shuai in an epic three-setter.
Roared on by a raucous crowd as the rain tapped on the closed roof of Arthur Ashe Stadium, Madison Keys claimed a 2-6, 6-4, 6-1 win over Russian Elena Vesnina
US Open 2017: Rafael Nadal, Karolina Pliskova eye 4th-round berths, Roger Federer takes on Feliciano Lopez
Nadal has also been slow to hit his stride on the Flushing Meadows hardcourts so far,
Connecticut Open: Daria Gavrilova claims maiden WTA title with hard-fought win over Dominika Cibulkova
Gavrilova, who ousted top seed and defending champion Agnieszka Radwanska in the semi-finals, beat second-seeded Cibulkova in a duel that lasted two hours and 45 minutes on the hard courts of Connecticut.
Connecticut Open: Daria Gavrilova stuns Agnieszka Radwanska to set up final against Dominika Cibulkova
Gavrilova advanced to the third WTA final of her career. She'll take on second-seeded Slovakian Dominika Cibulkova, a 6-1, 6-3 winner over Belgian qualifier Elise Mertens.