The Australian bushfires have caused devastation across the nation due to both their ferocity and sheer scale but they've also brought out the best in people around the world, with many digging deep to help those affected.

Donations for bushfire relief are approaching the $200 million mark after mining magnate Andrew Forrest announced he was tipping in $70 million in donations for bushfire relief from his Mindaroo Foundation.

Mr Forrest's donation comes after celebrities and sportspeople also vowed to tip in millions of dollars to the appeals, with Elton John and Chris Hemsworth putting in $1 million each.

At present there have been massive donations from every day Australians to charities as well as the more than $50 million that has been raised for The Trustee for the NSW Rural Fire Service Fund by comedian Celeste Barber.

Things kicked off for Australian sportspeople when tennis star Nick Kyrgios kicked things off by announcing he would personally donate $200 for every ace he hits across the summer as he got emotional talking about the bushfires.

His social media post caught the attention of plenty in the sporting world as recently as Tuesday when now-retired German NBA star Dirk Nowitzki said he would contribute.

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As for Kyrgios himself he's already over $11,000 worth of aces with the Australian Open still to come, and plenty of other tennis stars are kicking in.

Tennis will raise more money with the Rally for Relief ahead of the Australian Open to feature some of the sport's biggest names.

Cricket too is doing its part with big hitters Chris Lynn and Glenn Maxwell among others promising $250 per maximum they hit in the Big Bash and Peter Siddle, Adam Zampa and Kane Richardson have all said they would donate $200 for every wicket they take.

Australian great Shane Warne is auctioning his baggy green cap —as of Thursday morning, the highest bid was $520,500.