Swiss seek upset of defending Fed Cup champion Czech Republic, which is without Kvitova and Safarova.
The World No. 48 wants to skip Italy's upcoming Fed Cup tie, but sources say she's contracted to play.
It's not clear if the Canadian's relationship with current coach Thomas Hogstedt has changed.
The 2014 US Open champion pulls out with a knee injury.
Slovakia's Dominika Cibulkova made her feelings on Maria Sharapova quite clear.
Roberta Vinci climbs to a new career-high ranking, while Victoria Azarenka climbs to the top of the Singapore standings.
Nick Kyrgios became the top-ranked Aussie for the first time as a result of his semifinal performance in Miami.
