Novak Djokovic will hope to take another step towards a record 25th Grand Slam title on Saturday when he plays in the Australian Open third round, with the Melbourne tournament braced for 40C temperatures.
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The Serbian great faces 75th-ranked Dutchman Botic Van de Zandschulp for a place in the last 16, while reigning champions Jannik Sinner and Madison Keys are both in action.
On what promises to be a bumper day seven, multiple major winners Iga Swiatek and Naomi Osaka also both feature.
The forecast scorching weather has forced a change of schedule, with matches moved forward to allow more play before the temperatures hit their predicted peak in the late afternoon.
The American ninth seed Keys will get play under way on Rod Laver Arena at the slightly earlier time of 10:30 am against unseeded Karolina Pliskova of the Czech Republic.
The winner plays the victor of the encounter between Jessica Pegula, the sixth seed from the United States, and Russia's Oksana Selekhmeteva.
As the mercury rises, men's champion Sinner of Italy plays another American in 85th-ranked Eliot Spizzirri on Rod Laver.
Second seed Sinner is bidding to win the Melbourne major for a third time in a row, emulating Djokovic.
The 38-year-old former world No 1 Djokovic is third up on centre court.
Djokovic has looked in imperious form in his two matches so far, yet to drop a set and striking a confident tone.
Djokovic, who has been scaling back the number of matches he plays to wring the most out of his ageing body, said: "I'm really happy I'm able to play this way, considering the lack of competitive matches for more than two months.
"It's all been positive so far, positive signs."
Last on centre court on Saturday is two-time Melbourne Park champion Osaka, who wowed the crowds earlier this week when she emerged for her opening match in a jellyfish-themed outfit.
On court she has not been so dazzling and faces home hope Maddison Inglis, a qualifier.
The winner goes up against either six-time Grand Slam champion Swiatek or 31st-seeded Russian Anna Kalinskaya.
Swiatek is aiming to complete the career Grand Slam of all four majors, with Australia the only one missing from her CV.
Amanda Anisimova, the fourth seed who has emerged as a major force in the past year, plays fellow American Peyton Stearns.
Other top seeds in action include Lorenzo Musetti of Italy, who clashes with Tomas Machac of the Czech Republic.
The winner goes up against either American ninth seed Taylor Fritz or the Swiss veteran Stan Wawrinka.
The 40-year-old Wawrinka must try and rouse himself on his Australian Open farewell after a gruelling five-set win in round two.