Wildcard Maria Kirilenko fought back from a set down to claim the scalp of third seed Klara Koukalova at the Korea Open.
Two-time grand slam winner Li Na is set to announce retirement from tennis, according to reports.
Andy Murray has declared his support for the Yes campaign in the independence referendum.
Angelique Kerber came through a tough test against Elina Svitolina to reach the Toray Pan Pacific Open quarter-finals.
Agnieszka Radwanska and Karolina Pliskova both booked their places in the quarter-finals of the Kia Korea Open.
Wang Yafan was made to work hard for her victory over Petra Martic at the Guangzhou International Women's Open.
Great Britain captain Leon Smith will be keeping his fingers crossed for a home tie when the draw is made on Thursday.
Andy Roddick will return to London to make his debut at the Statoil Masters Tennis at the Royal Albert Hall in December.
Andy Schooler's latest Net Talk column considers what lies in store for Great Britain in Thursday's 2015 Davis Cup draw.
Former world number seven Nicole Vaidisova returned to professional tennis with a win on Tuesday in New Mexico.