Serena Williams is set to face Roger Federer in her first event of the 2019 season when the USA play Switzerland in the mixed doubles 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 partners Frances Tiafoe, while 20-time Grand Slam winner Federer and Belinda Bencic will seek to defend their title.
Cameron Norrie and Katie Boulter will represent Great Britain in Perth.
"The Aussie fans are always so warm and supportive and the Hopman Cup has always given me a great start to the season, especially ahead of the Australian Open," said Williams, who pulled out of this month's China Open.