Sea and air rescue operations started on Friday when mass evacuations were undertaken in cities that could be devoured by flames.
"January in Australia has been my home for 15 years," Sharapova wrote on Twitter.
"It is profound (heartbreaking) to watch the fires destroy the country, its beautiful families and animal communities.
"I want to start my donation at 25,000. @DjokerNole, would you match my donation?"
The defending champion of the Australian Open replied on Monday with his support: "Yes, @MariaSharapova, I would like to add up your $ 25,000 donation to double the aid given to these communities," Djokovic wrote on Twitter. "We stand by you, #Australia."
Five-time Grand Slam winner Sharapova will compete at Brisbane International on Monday, while number 2 in the world, Djokovic, fought for Serbia at the ATP Cup before the Australian Open.
Ashleigh Barty, the top seed in Brisbane, will donate their winnings to the Australian Red Cross Bushfire appeal tournament.
The Australian, who won her first Grand Slam title at the French Open last year, had already donated $ 20,850 ($ 30,000) to the RSPCA to support wildlife affected by the fire and would donate another $ 265,500 ( AUSD) should donate $ 382,000 in Brisbane.
"The wildlife has been lost, but it has also affected lives and homes, and I've been thinking with my team and family about how we can help," Barty told reporters on Sunday.
"There were really great initiatives from cricketers, tennis players, golfers and soccer players across the country trying to help."
This week's players began to raise donations for every ace they hit in upcoming tournaments.
Kyrgios and compatriot Samantha Stosur pledged $ 140 for each ace, while Alex de Minaur and John Millman intervened with donations of $ 175 and $ 70 per ace, respectively.
World No. 4 Simona Halep has agreed to use her trainer as a fundraiser: "Guys, you know I love Australia, but you also know that I don't hit too many aces," she wrote on Twitter.
"Sooo, I want to help and my promise is this: every time I give @darren_cahill a hard time in my box during all my matches in Aus, I will donate $ 200.
"This way I'm going to collect a lot more money."
Tennis Australia has pledged $ 700,000 (USD 1 million) to repair tennis facilities damaged by the fire, and the organization will also donate $ 100 ($ 70) for each ace hit in the ATP Cup.
A relief rally will be held at Rod Laver Arena in Melbourne Park on January 15th.
The bushfires have also caused Canberra International, one of the tournaments that are part of the preparation for the Australian Open, to be moved 600 kilometers to the city of Bedigo.