But defending Australian Open champion Roger Federer was circumspect on Thursday night saying the heat is part and parcel of the Australian Open and believes organisers are doing their best to put player welfare before profits.
Among men through to the third round was Spains 21st seed Albert Ramos-Vinolas, who swept past American Tim Smyczek in straight sets.
Chung showed another sign of his promise by coolly closing out a five-set win over German fourth seed Alexander Zverev, a player many pundits have widely tipped as a future grand slam victor.
A moment of controversy in the game came midway through the second set when the umpires communicated to the players that Hawk-eye is down and there can not be any challenges made till the service is back up. Maybe when she had the match balls, maybe I would have lost it.
"Something I've been working on, and definitely improved in the match today.
I'm looking forward to the next challenge", said Djokovic.
"I think I'm just very well aware that I think in this world everyone has an opinion and that no matter what you do, or no matter how you play tennis, or what you say, or how you go about your life, not everyone will like the way that you do it", she said.
The heat peaked during Djokovic's 4-6, 6-3, 6-1, 6-3 win over Monfils. "I think he was a fascinating character". The 2014 champion, seeded ninth, only made a decision to play in Melbourne on the eve of the tournament and was well below his best as he lost 6-2 6-1 6-4 to Tennys Sandgren of the USA. Halep wasted chances to serve for the match in the ninth, 11th and 15th games, then had to save three match points in the 22nd.
"I hope I survive under those conditions too because if you want to get to the top you have to play in all sorts of conditions".
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"Of course this was quite a big match", Kerber, who began working with new coach Wim Fissette at the end of a year ago, told reporters.
Defending champion Federer, 36, defeat Aljaz Bedene 6-3, 6-4, 6-3 in a night match, his first on Rod Laver Arena since clinching a career-reviving title here past year.
"The second set was tight".
That was until 62nd-ranked Gojowczyk rallied to break Zverev in the third game of the third set and held the advantage bravely to make a game of the contest.
With the temperatures a manageable 26 Celsius (79 Farenheit) at Melbourne Park after two days of oven-like conditions, the Russian was no match for the German, flopping 6-1, 6-3 in a battle of the former champions.
"The feeling in my muscles is gone and I don't feel my ankle any more", she added.
"Its a huge deal for me, and something that if I dont ever get another accomplishment, I can at least hang my hat on this one", Sandgren said.
And soon they'll be one: There are two Grand Slam singles champions left in the women's draw, and they will play each other Saturday in the third round - Maria Sharapova (2008 Australian Open winner) vs. Angelique Kerber (2016 Australian Open champion).
Djokovic will now taken on Hyeon Chung in the next round, who pulled off the biggest upset of the day with a five set victory over fourth seed Alexander Zverev.