Nadal is just one behind at 19 but Djokovic is four from the Swiss.
'This was definitely an incredible kick off.
The fundraiser comes just days before the Australian Open main tournament begins on Monday (20 January), although there are growing concerns poor air quality in Melbourne from Victoria and New South Wales' bushfire smoke could disrupt play.
Djokovic is hunting his 17th Grand Slam title in Melbourne while Nadal is hoping to tie Federer's record.
He then addressed fans in the stands saying: 'You guys too, because of you coming to the stadium tonight, that has also helped. "He knows if I can win the Australian Open I am going to have a great year, it's a good start of the year".
Federer said: "It's been hard (to watch)".
With select firefighters and emergency personnel looking on from courtside seats, Kyrgios saved two set points before Federer prevailed in an entertaining encounter. "You come together for other people and I think that's an inspiration for many other countries around the world watching this right now" he continued.
'And to have some fun, have a hit with Nick. we get along very well.
"It's been an emotional couple of weeks".
Probably both most impressive matches that I belonged to were the last versus Rafa below in 2012 that virtually went 6 hrs, the document of the lengthiest ever before last in background.
"And the season they had (in 2019), again, shows that there is more to come for them".
Some might prefer the romance of a Roger Federer triumph in the twilight of his career or for one of the younger generation finally to break through and end the stranglehold of the "Big Three", who have divided the last 12 Grand Slam titles between them.
'The awareness has grown and I think we're doing everything we possibly can to overcome this'.
Federer said he and other players were only too happy to help out a nation in which he spends almost one month of the year.
Schnur described how tough it was during his qualifying matches describing the feeling like smoking a cigarette.
The ATP on Sunday pledged 500,000 US dollars to the World Wildlife Fund (WWF) Australian Wildlife and Nature Recovery Fund as part of the bushfire relief efforts. His Twitter pledge of $200 per ace throughout the Australian summer inspired colleagues into action, prompting Tennis Australia to announce the Rally for Relief evening.
Seeded eight, she heads into the tournament on the back of ending a three-year title drought by winning the Auckland Classic.