Roger Federer said he requested an evening match against Jan-Lennard Struff in the second round of the Australian Open but would not have minded playing in searing heat earlier on Thursday.
Novak Djokovic revealed he was "right at the limit" of his physical and mental endurance in "brutal" Melbourne temperatures following a win over Gael Monfils, who said he was "dying on court for 40 minutes."
It was almost 40 degrees Celsius when Djokovic and Monfils were doing battle on Rod Laver Arena, so dropped to around 30°C by the time Federer defeated Struff 6-4 6-4 7-6 (7-4).
The defending champion revealed that he asked to play at night, but there were no guarantees that he would be granted his wish.
"There are maybe 60 guys asking for stuff and I am one of those guys, yes," said the 19-time grand slam champion.
"Possibly [I have more leverage] but it is not my call it is their call. There are guys like Novak, other guys who they're going to listen to of course, the Aussies. TV as well,
"I am happy I didn't have to go from night to day and back to night, so I was happy to stay in the same rhythm. I wouldn't have minded playing during the day.
"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. It is more helpful to play now than in the day."
Federer, who will play Richard Gasquet in round three, reflected on another job well done after his second straight-sets victory of the week.
"I'm happy I'm still part of [the tournament] really, because I knew Struff could be tough today." said the second seed.
"If you look at the last two matches that I've played, I felt like both of my opponents [he beat Aljaz Bedene on Tuesday] pretty much kind of went for broke. When they see a mini chance to get on the offensive, they just go for it.
"You don't want to be in defence too much. The moment you see an opening, you go for it."
|Spain survive scare, USA cruise in World Cup qualifying|
|Shapovalov moves into Delray Beach Open semis|
|Davis, Jokic star with huge performances|
|Alli doesn´t dive, says Hodgson|
|Timberwolves star Butler suffers knee injury|
|Penguins acquire Brassard in three-team trade|
|Verdasco ends Thiem´s Rio Open title defence, Monfils exits|
|Salah has world´s best left foot? Don´t forget Messi – Klopp|
|Pochettino: Vertonghen one of Europe´s best defenders|
|He hasn´t raised the bar – Wenger plays down Guardiola success|
|Woods stays solid as List, Lovemark lead|
|Cake and victory for birthday boy Pouille|
|Klopp ´really proud´ of Firmino after Holgate case dropped|
|Munster upset Warriors as Leinster crush Southern Kings|
|Bouchard ´vindicated´ after USTA settlement|
|Warriors fall to impressive Wolves, Saints stay perfect|
|Conte: Chelsea´s winning mentality can´t be questioned|
|Benching Willian was a fantastic decision, boasts Chelsea boss Conte|
|Juventus critics don´t know Tottenham, says Pjanic|
|Hull City 1 Sheffield United 0: Dicko blunts Blades´ promotion chase after fan protest|
|Bastareaud stars as France get off the mark against Italy|
|Jaguars reward Marrone & Coughlin with two-year extensions|
|Lukaku tipped for ´big things´ by United team-mate Matic|
|Kasatkina saves three match points to stun Muguruza|
|Emery hopes Classique can inspire Real Madrid comeback|
|I thought he was an actor! - Valverde dodges Arthur questions|
|Valverde hints at resting Messi, Suarez for Girona clash|
|Napoli sign free agent Milic|
|Barclay labels England ´massive favourites´ for Calcutta Cup|
|Johnson tells England: Don´t give Scotland ´scent of victory´|
|Zidane offers condolences after Basque police officer´s death|
|FA charge Guardiola over yellow ribbon protest|
|City have to lift titles - Guardiola focused on Wembley glory against Arsenal|
|Spalletti urges Inter to ´believe in our strength´ and end wretched run|
|Best unconcerned with Sexton fitness|
|Christensen a future Chelsea captain, says Conte|
|Fonte leaves West Ham for Dalian Yifang|
|Guardia Civil search Guardiola family´s plane|
|Unwell Neymar facing race to make Le Classique|
|Playing Chelsea means less and less every year, says Mourinho|
|Conte hopes Manchester United bench ´fantastic´ Pogba|
|Dembele ´a genius of football´ like Maradona and Ronaldinho, claims Pochettino|
|Otaegui surges into slender lead in Qatar|
|Villarreal suspend Semedo after attempted murder allegation|
|Jesus could return but Guardiola has doubts over Sterling|
|He took 10 seconds to be ready – Mourinho salutes professional Pogba|
|Alderweireld a doubt as Pochettino stays silent on transfer rumours|
|Conte dismisses Mourinho tension|
|Nothing is decided - Klopp urges against Liverpool complacency|
|Heynckes ´can´t imagine´ Bayern sanctioning Lewandowski sale|
|FIFA closes Neymar´s Barcelona bonus case|
|Bale still important to Real Madrid, Zidane insists|
|Heynckes plays down Robben´s frustration|
|Central Coast Mariners 1 Wellington Phoenix 0: Hosts end 11-match winless run|
|Arsenal handed tough Milan test in Europa League´s round of 16|
|Europa League: Last-16 draw in full|
|I am the lion of the jungle - Wilder ready to pounce on Ortiz|
|Vitolo apologises for sexist ´joke´ after Atletico win|
|Paletta joins Jiangsu Suning|
|Messi, Ronaldo and Neymar are the only superstars, says Pele|
|Rebels capitalise on Higginbotham red, Highlanders beat Blues in thriller|
|Arsenal have ´unfinished business´ in EFL Cup after 2011 loss - Wilshere|
|Srna given 17-month doping ban|
|Winter Olympics 2018: Larocque apologises for silver-medal snub|
|Arsenal boss Wenger backs Wilshere after Keane rant|
|Basque police express ´dismay´ at death of officer after fan violence|
|Jones was alarmed by England´s lack of fitness|
|Wembley hero Ramsey winning race to face Manchester City|
|McLaren launch new-look MCL33|
|EFL Cup final: Bravo and Ospina pitch to be heroes before stepping back into the shadows|