Australia Open
The dressing room might not be the most welcoming place for Djokovic either, with some players resentful that he is not vaccinated.
Serena Williams has been handed a challenging draw in her quest for a record-equalling 24th Grand Slam title at the Australian Open, starting with Germany's Tatjana Maria in the first round.
World number one Novak Djokovic will start his bid to win a record seventh Australian Open title next week against a qualifier following Thursday's draw.
"It's (Hopman Cup) obviously the perfect preparation for the Australian Open and it worked so well the last couple of years, I can't wait to come back," Federer told reporters.
Pliskova will meet top seed Simona Halep for a place in the semi-finals.
Stan Wawrinka was knocked out of the Australian Open by unheralded American Tennys Sandgren on Thursday
Players will have an additional five seconds between points at next year's Australian Open but time-wasters will have nowhere to hide thanks to the introduction of shot-clocks.
Roger Federer believes Andy Murray should follow his lead by ensuring he does not rush back to competitive action too quickly following the Scot's injury-ruined season.
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