Caroline Wozniacki, Sabine Lisicki and Sloane Stephens advanced to the second round in the Luxembourg Open.
Order of play for day one of the US Open, with Rafael Nadal, Roger Federer, Serena Williams and Laura Robson all in action.
Serena Williams eased into the third round of the WTA Bastad open with a 6-2 6-3 win over Anna Tatishvili.
Serena Williams enjoyed a comfortable afternoon on her first WTA appearance since Wimbledon on the red clay of Bastad.
Top seed Novak Djokovic will aim to get in the zone to negotiate the dangers of facing a low-ranked player at Wimbledon.
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.
It is tempting to classify American women's tennis in recent years as Serena Williams... full stop.
Serena Williams takes on Mandy Minella first on Centre Court before 2011 champion Novak Djokovic meets Florian Mayer.
Serena Williams will want to banish thoughts of her weekend spat with Maria Sharapova and let her racquet do the talking.
Rising American Sloane Stephens has taken quite a liking to Wimbledon's grasscourts - and a local curry house.
Serena Williams launched a charm offensive on Sunday as she sought to broker a truce with Maria Sharapova.
Serena Williams will face Mandy Minella in the opening round of Wimbledon.
Laura Robson and Heather Watson crashed out of the Aegon Classic in Birmingham.
British number two Heather Watson won her first WTA Tour match since February at the Aegon Classic in Birmingham.
ATP World Tour Finals
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