Serena and Venus Williams remain on course to meet in the WTA Dubai final after both claimed victories in the last eight.
Italy’s Flavia Pennetta stunned world number three Agnieszka Radwanska in straight sets to earn a quarter-final spot in Dubai.
Round-up: Li Na and Agnieszka Radwanska were among the big names to progress to the third round of the Qatar Open.
Round-up: Maria Sharapova cruised into the Paris Open semi-finals, the top seed toppling Kirsten Flipkens 6-2 6-2.
Round-up: Victoria Azarenka took a little while to get going before she overcame Johanna Larsson 7-6 6-2 at the Australian Open.
First round draw for the women's singles at the Australian Open after qualifying and the withdrawal of Jamie Hampton.
List of women's seeds for the Australian Open which begins on Monday: 1.
Laura Robson and Jelena Jankovic both had their Australian Open preparations thrown into disarray on Monday.
Number three seed Ana Ivanovic made a winning start to her Linz Open campaign with a 6-2 6-4 victory over Yanina Wickmayer.
Venus Williams continued her run of form in Tokyo with a battling 6-3 6-7(4) 6-3 win over Canadian hope Eugenie Bouchard.
Order of play for day four of the US Open, with Rafa Nadal, Roger Federer, Serena Williams and Victoria Azarenka all on court.
Order of play for day three of the US Open, with Andy Murray and Serena Williams both in action.
Order of play for day one of the US Open, with Rafael Nadal, Roger Federer, Serena Williams and Laura Robson all in action.
Organisers have announced the seedings for the US Open and Roger Federer is seeded only seventh.
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