Belinda Bencic of Switzerland hits a return against Naomi Osaka of Japan during their women's singles match on day one of the Hopman Cup tennis tournament in Perth

Roger Federer of Switzerland hits a return against Yuichi Sugita of Japan during their second session men's singles match on day one of the Hopman Cup tennis tournament in Perth

Coco Vandeweghe of the US hits a return against Anastasia Pavlyuchenkova of Russia during their first session women's singles match on day one of the Hopman Cup tennis tournament in Perth

Anastasia Pavlyuchenkova of Russia hits a return against Coco Vandeweghe of the US during their women's singles first round match on day one of the Hopman Cup tennis tournament in Perth