Laura Robson will miss the French Open and Wimbledon after deciding to have minor wrist surgery.
Dominika Cibulkova reached the quarter-finals of the BMW Malaysian Open with a straight-sets victory over Hsieh Su-wei.
Leading seeds Rafael Nadal, Roger Federer and Stanislas Wawrinka are in the Monte Carlo Masters third round.
Dominika Cibulkova reached the second round of the Malaysian Open with a straight-sets victory over Pemra Ozgen.
Britons Johanna Konta and Heather Watson have just missed out on a place in the main draw of the French Open.
Fed Cup captain Judy Murray believes Laura Robson cannot be too careful with her troublesome wrist injury.
Andy Murray and Martina Navratilova are among a host of star names who will help raise money in June to fight cancer.
The full schedule for this year's expanded WTA Championships in Singapore has been announced.
Novak Djokovic has made a convincing start to the defence of his Monte-Carlo Rolex Masters title.
The French Open will pay total prize money of more than 25million euros at this year's tournament.