"Yeah, I think it was the hardest I have (experienced)", Monfils said after the match. "It was really warm, it was tough to breathe". Djokovic said there should be rational conversations about rules that are imposed and that concern players' well-being.
Djokovic looked far from his best in the 39-degree heat but was still too good for the enigmatic world No.39, maintaining his flawless record against Monfils with a 4-6 6-3 6-1 6-3 victory. "I think there are certain days where you just have to, as a tournament supervisor, recognize that you might need to give players a few extra hours until (the heat) comes down".
But he said the conditions were at the point where it becomes a "danger in terms of health".
"It was right at the limit [today]".
Post-match, Monfils said he felt like he was "dying" for 40 minutes, while Germany's Andrea Petkovic told Reuters heat-related fatigue wore her down mentally.
"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.
Maria Sharapova returns to Rod Laver Arena for the first time since her drug ban for a second round match against Anastasija Sevastova on Thursday as players, officials and fans alike prepare for sweltering heat at the Australian Open.
Another mother took her three-year-old child out of the stadium to cool down as the heat became too much to bear, AAP understands.
"Good luck to them", he said. "I think sometimes we put our body at risk".
Fifth seed Dominic Thiem showed tremendous mental and physical resilience to defy the conditions and come from two sets down to beat Denis Kudla 6-7 (6/8) 3-6 6-3 6-2 6-3.
The meeting between Simona Halep and Eugenie Bouchard might bring a little frost to a hot day as the top seed and World No 1 said previous year she did not talk to the Canadian, who beat her in the 2014 Wimbledon semi-finals.
Sure enough, world No. 88 Hsieh Su-wei of Taiwan defeated Muguruza 7-6 (7-1) 6-4 and twice grand slam semifinalist Konta - downed by Hsieh at the French Open last May - succumbed to lucky loser Bernarda Pera 6-4 7-5.
Sharapova returned to Melbourne Park this year after sitting out the 2017 edition due to a drug suspension. "I respect that. It's not easy also for him to sit out there and kind of control both players".
"I was watching this tournament with a box of Kleenex next to me, sick", the five-time grand slam victor said. I couldn't feel fresh. It's still that motion that I'm kind of getting used to.
"I did a big effort", said del Potro.
It was not only Djokovic and Monfils struggling in the heat, Juan Martin del Potro also had to play in the hottest part of the day, the Argentine beating Karen Kachanov in four sets.
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