Defending Australian Open champion Serena Williams’ comeback in Melbourne is in further question as the new mother was announced as a keynote speaker at the ETFs conference scheduled in Florida during Week 2 of the Slam.

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Williams, who has not played since winning her 23rd Slam in January, is on the entry list for the Australian Open, but has been quiet as to whether she will be ready to comeback after giving birth to daughter Alexis Olympia Jr. in September.

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Australian Open tournament director Craig Tiley has said he is expecting to see Williams back in action in Melbourne Park.

"She's got her visa, she's entered, she's practicing and she's probably just got to find a bit more space for a bigger entourage,” Tiley said.

With the tournament just a month away, it is still unclear as to whether the sport’s biggest star and biggest question mark going into 2018 will be Down Under.

Follow Thomas on Twitter @thomas_cluck917.