Blistering Melbourne summer weather will see Australian Open matches moved indoors with play stoppages also likely over the next few days.
The mercury is set to hit 40 degrees on Saturday, 30 degrees on Monday, before topping out at a sweltering 41 degrees on Tuesday.
Australian Open organisers have already responded to the predicted weather on Saturday by scheduling an extra day match on Margaret Court Arena.
This will mean ground pass ticket fans will only have the opportunity to cram into KIA Arena for three of the lesser singles matches or try to get into limited seating at John Cain Arena.
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The status of other scheduled matches in doubles, juniors and wheelchair tennis is in doubt, with play suspensions likely if the heat soars about 40 degrees.
This could see certain matches moved indoors to vacant venues, while play will likely extend deep into the cooler evenings if match pauses are long.
Fans will need to look after themselves at Melbourne Park, with plenty of shade and water stations around the tennis precinct.
Tuesday - when the temperature is predicted to reach 41 - is the first day of singles quarter-finals, with all matches usually on Rod Laver Arena.
However, the outside courts will be at serious risk of disruption if the mercury rises to uncomfortable levels.