Players have been donating for aces, double faults, drop shots and more. (Getty Images)

Players have been donating to the Australian bushfire relief effort all month long, with aces, double faults, drop shots, social posts and even entire prize money donations. 

The Grand Slams have joined the great cause, announcing a donation of $400,000 on Monday. 

The USTA, on behalf of the US Open, provided the $100,000

“The USTA has a long track record of supporting communities hurt by devastating natural disasters, and though our efforts have traditionally been to support communities in the United States, we are joining with the world in helping our friends and colleagues in Australia,” said Patrick Galbraith, current USTA Chairman of the Board and President.

Nick Kyrgios was one of the first players to get the ace donation ball rolling: 

His compatriots jumped on board including...

Samantha Stosur:

Alex de Minaur and John Millman: 

And Matt Reid:

Players soon joined in from all around the globe including...

Maria Sharapova and Novak Djokovic:

Karolina Pliskova:

Belinda Bencic:

And Alize Cornet and Simona Halep:

Ashleigh Barty and Serena Williams both donated their Brisbane prize money: 

The WTA is giving $100 AUD per ace for singles and doubles in Brisbane, Adelaide, Auckland and Hobart. On Sunday, the ATP announced a $500,000 donation from the players after Serbia topped Spain in the ATP Cup final.  

In Brisbane and Adelaide, players have had a chance to get up close and personal with koalas, kangaroos and more species unique only to Australia.

While usually just a memorable photo-op, these interactions mean a lot more to the players with the wildfires raging across nearly 28 million acres and killing an estimated billion animals.

Exhibitions have also been organized to boost donations. The Rally for Resilience was held on Saturday in Adelaide with Angelique Kerber and Simona Halep volunteering their time. 

On Wednesday, the Australian Open will host a Rally for Relief exhibition with Djokovic, Serena, Rafael Nadal, Roger Federer, Caroline Wozniacki and Stefanos Tsitsipas to raise even more money for relief efforts.