Serena Williams had a tougher time against Kiki Bertens – but won in straight sets.
Andy Murray aims to join them in round three tonight.
He faces Frenchman Adrian Mannarino
British number two Aljaz Bedene is also in action, as he takes on Donald Young of the USA.
In the women's, Johanna Konta goes against Wimbledon runner-up Garbine Muguruza who she holds a recent win over.
