Vincent Thian
Russia's Maria Sharapova signs autographs after defeating Germany's Tatjana Maria during their first round match at the Australian Open tennis championships in Melbourne, Australia, Tuesday, Jan. 16, 2018. (AP Photo/Vincent Thian)

MELBOURNE, Australia (AP) — Maria Sharapova was set to take on Anastasija Sevastova at the start of play Thursday on an expected day of scorching temperatures at the Australian Open.

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The forecast was for temperatures approaching 40 degrees Celsius (104 Fahrenheit), and delays were likely on side courts if the tournament invokes its Extreme Heat Policy. Officials also have the option of closing the roofs on the three show courts, including Rod Laver Arena.

Sharapova is playing here for the first time since serving a 15-month doping ban after testing positive for meldonium at the 2016 Australian Open.

Wimbledon winner Garbine Muguruza, defending champion Roger Federer and six-time Australian winner Novak Djokovic were also scheduled to play their second-round matches Thursday.