Serena Williams is set to meet Roger Federer on court as the USA has been tied against Switzerland in the mixed doubles competition at the Hopman Cup.
Williams, 37, has not played since her controversial US Open final defeat by Naomi Osaka in September.
The 23-time Grand Slam champion will partner with Frances Tiafoe, while 20-time Grand Slam winner Federer and Belinda Bencic will seek to defend their title.
Representing Great Britain in Perth will be Cameron Norrie and Katie Boulter.