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."
|Red Bull confirm Honda switch|
|Arzani has a big future, says ´surprised´ Jakobsen|
|Goalkeepers are the victims of FIFA - Talking balls at Russia 2018|
|Mexico boss backs Lozano for Premier League move|
|Yankees, Nationals split unconventional doubleheader|
|Southgate praises Maguire´s performance|
|The only thing Kane hasn´t done is score in August - Southgate|
|Fenerbahce part ways with Kocaman|
|Celtics forward Hayward expected to be fully cleared by August|
|Nationals acquire closer Herrera from Royals|
|Angels star Ohtani to be re-evaluated in 2-3 weeks|
|Crisis club Sporting appoint Mihajlovic|
|Fekir could still join Liverpool this summer - agent|
|Brathwaithe and weather thwart Sri Lanka|
|Southgate bemused by England-Tunisia penalty decisions|
|Kane disappointed by refereeing decisions despite England win|
|Koepka backed by coach to win more majors|
|Rybarikova ousts Pliskova in Birmingham, seeds fail in Mallorca|
|Kane: England players had flies in our mouths|
|Lemar signs Atletico deal|
|Griezmann renews Atletico Madrid contract after rejecting Barcelona|
|Captain Kane comes good to heighten England´s aura of optimism|
|Wawrinka and Cilic cruise through at Queen´s|
|Saudi Arabia team safe after aircraft´s ´technical failure´|
|Courtois: Panama made unnecessary tackles|
|Thiem makes winning start on Halle grass|
|Tunisia 1 England 2: Captain Kane saves Three Lions|
|Trotz resigns as Capitals coach after Stanley Cup win|
|You´ll see the best of Hazard later - Eden predicts strong World Cup|
|Mickelson made statement over ´outrageous´ conditions, says Cowen|
|France will grow again - former coach Saint-Andre sees positive signs for Les Bleus|
|Lewandowski sets an example - Nawalka talks up Poland star|
|Runners and Ryders: Koepka shines at Shinnecock Hills as European list sees major changes|
|Mature and patient Belgium show success could be on horizon|
|Salah facing fitness test ahead of Russia v Egypt|
|South Korea´s Park has suspected hamstring tear|
|Sweden hero Granqvist full of praise for VAR|
|Iran v Spain: Isco impressed with Hierro´s seamless adaptation|
|Belgium 3 Panama 0: Mertens magic sets up Group G win|
|Jorginho has ´five-year Man City deal waiting´|
|Wolves sign Portugal goalkeeper Patricio|
|Pekerman criticises Barcelona´s treatment of Yerry Mina|
|Neymar misses Brazil World Cup training|
|FIFA opens disciplinary proceedings over alleged Mexico homophobic chants|
|Cisse hoping to be a pioneer for black and African coaches|
|World Cup over for Croatia´s Kalinic|
|Defiant Jones confident of upturn in England fortunes|
|Pogba a natural leader for France - Matuidi|
|Frampton to face Jackson as Fury continues comeback in Belfast|
|Team effort needed for Japan to stop James, says Nishino|
|Di Francesco extends Roma contract|
|It was a normal challenge - Switzerland equaliser fine by Shaqiri|
|Hamilton hopes to avoid ´boring´ French Grand Prix|
|Coutinho expects more Neymar punishment at World Cup|
|Cisse hails Mane as ´one of the best players in the world´|
|Forsberg falls flat as Granqvist proves Sweden´s hero|
|Sweden 1 South Korea 0: Granqvist´s VAR-assisted penalty settles tight game|
|Nishino concerned Japan players affected by Osaka earthquake|
|Isco pleased with Lopetegui´s Real Madrid appointment|
|Hazard hints at Real Madrid interest|
|Wasps disappointed as Wilson joins Scotland backroom staff|
|Hierro has full confidence in De Gea|
|Russia will stop Salah - Cherchesov|
|Allen signs new four-year Stoke contract|
|England issue update over injured duo Stokes and Woakes|
|Mancini leaves door open for Buffon´s Italy return|
|Alli calls for England to be ruthless in World Cup opener|
|Tahir rested as Proteas call up uncapped duo|
|Uruguay v Saudi Arabia: Centurion Suarez seeks World Cup redemption|
|Portugal v Morocco: Hat-trick hero Ronaldo hunts stricken Atlas Lions|