Madison Keys only lost three points in the second set as she beat Zhang Shuai 6-4 6-0 to move into the quarters in Osaka.
Laura Robson lost to a woman 24 years her senior as she went out in the opening round of the Japan Open.
Britain's Heather Watson crashed out of the Japan Open in the opening round in Osaka.
Agnieszka Radwanska continued her devastating form with a 6-2 6-0 win over Vera Dushevina to reach the semi-finals in Seoul.
Women's world number one Serena Williams has pulled out of next week's Pan Pacific Open in Tokyo citing fatigue.
Agnieszka Radwanska cruised into the quarter-finals of the Korea Open with a crushing win over Estrella Cabeza Candela.
Heather Watson lost in three sets in the first round of the Korea Open to Japan's Kimiko Date-Krumm - a woman double her age.
Order of play for day one of the US Open, with Rafael Nadal, Roger Federer, Serena Williams and Laura Robson all in action.
Serena Williams moved almost effortlessly into the last 16 at Wimbledon with a crushing 6-2 6-0 win over Japanese veteran Kimiko Date-Krumm.
Round-up: Serena Williams continued her march to a Wimbledon title defence with a 6-2 6-0 win over Kimiko Date-Krumm.
Martina Navratilova wonders why Kimiko Date-Krumm retired so early when she is now so clearly revelling at the age of 42.
Round-up: Serena Williams eased into the third round with a 6-3 6-2 win over Caroline Garcia.
Laura Robson opened her Wimbledon campaign with a convincing 6-3 6-4 win over Maria Kirilenko.
Round-up: Serena Williams began the defence of her Wimbledon title with a comfortable 6-1 6-3 victory over Luxembourg's Mandy Minella.
Anne Keothavong became the first British player to exit WTA Birmingham as she slumped to a 7-5 6-2 first-round defeat.
ATP World Tour Finals
View : 39587 times
View : 23189 times
View : 22942 times
View : 19454 times
View : 16633 times
Find detailed TV schedules – click here.
Find all the sports news on iPhone, BlackBerry, Android and iPad.
Download the latest Eurosport Australia TV schedules for your favourite sports FREE to your calendar. It's a simple three step process!