Novak Djokovic and Serena Williams, with 13 Australian Open titles between them, play their first-round matches Tuesday at what is expected to be a steamy Melbourne Park.

Williams, who has seven Australian titles and last won here in 2017, plays Tatjana Maria in the second match at Rod Laver Arena.

Top-seeded Djokovic, who will attempt to win a men’s record seventh Australian title, opens night play on the same court against American Mitchell Krueger.

The temperature was already 30 degrees Celsius (86 Fahrenheit) when play began on all courts shortly after 11 a.m. local time and it was expected to rise by several degrees.

The sun and humidity added to the sultry conditions, forcing many of the early spectators to take relief by standing under giant cooling mist machines.

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Serbia's Novak Djokovic, right, presents a trophy to Rod Laver during the 50th anniversary celebration for Australian Open and Rod Laver's second Grand Slam at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. (AP Photo/Aaron Favila)
Serbia’s Novak Djokovic, right, presents a trophy to Rod Laver during the 50th anniversary celebration for Australian Open and Rod Laver’s second Grand Slam at the Australian Open tennis championships in Melbourne, Australia, Monday, Jan. (AP Photo/Aaron Favila)