Number three seed Ana Ivanovic made a winning start to her Linz Open campaign with a 6-2 6-4 victory over Yanina Wickmayer.
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.
Victoria Azarenka's win over Magdalena Rybarikova paled into insignificance following the news of Marion Bartoli's retirement
Round-up: Serena Williams fought back from a set down to beat Eugenie Bouchard 4-6 6-2 6-2 in Cincinnati.
Factbox on Wimbledon champion Marion Bartoli, who announced her retirement from tennis at 28.
Round-up: The Maria Sharapova-Jimmy Connors partnership got off to a rocky start as Sloane Stephens shocked the Russian.
Round-up: Defending champion Petra Kvitova suffered a shock exit when Sorana Cirstea beat the Czech 4-6 7-5 6-2 in Toronto.
Serena Williams cruised into the last eight of the Rogers Cup with a 6-0 6-3 victory over Kirsten Flipkens in Toronto.
Round-up: Serena Williams made a successful return to hard courts with a 6-3 6-2 thrashing of Francesca Schiavone in Toronto.
Round-up: Venus Williams slumped to a 0-6 6-4 6-2 loss to Kirsten Flipkens in the Rogers Cup first round.
Round-up: Sam Stosur won a first title this season against Victoria Azarenka, while Magdalena Rybarikova won in Washington.
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.
Laura Robson set up a second round clash against Caroline Wozniacki at Eastbourne after beating Yulia Beygelzimer.
ATP World Tour Finals
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