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."
|WATCH: Paul shimmies in Curry´s face|
|Copa Libertadores Review: Estudiantes into last 16 after thrilling win over Nacional|
|Ronaldo: Cristiano and Neymar would be good together at Madrid|
|Rockets honour Santa Fe victims, first responders at game five|
|Real Madrid rejected €150m offers for Asensio – agent|
|Marshall, Baldwin react strongly to Trump´s comments on NFL anthem stance|
|Nabura handed six-week ban for wild kick|
|Pedroia to return for Red Sox on Friday|
|Warriors´ Iguodala ruled out for game five against Rockets|
|Na leads as Spieth makes solid start at Colonial|
|James Harden, LeBron James headline 2017-18 All-NBA first team|
|Manchester United target Fred to decide future after World Cup|
|´Incredible´ Salah is like Messi, says Ronaldo|
|Salah a big candidate for Ballon d´Or - Muller|
|Message from coach keeping Masters champion Reed grounded|
|Anybody can really win it - Seles feels French Open is wide open this year|
|Mambo number 5! - Non-league star channels Lou Bega hit|
|Pakistan to stop wearing smart watches after ICC intervention - Hasan|
|Saha hails ´great man´ Ferguson as legendary Man Utd boss continues recovery|
|Emery´s depth of knowledge impressed Arsenal´s Gazidis|
|Conceicao extends Porto contract|
|Lomax impresses as Saints overrun Tigers|
|McIlroy in contention at Wentworth as Bjerregaard sets the early pace|
|Bad light calls time on Thiem, Wawrinka out in Geneva|
|Garitano in, Canales out at Real Sociedad|
|Caparros accepts new role at Sevilla|
|Pliskova downed by Larsson after drawing Serena in Paris|
|They´re using the anthem as fake patriotism - Warriors coach Kerr critical of NFL|
|Lyon win record fifth Women´s Champions League title|
|French Open 2018: Doing the unthinkable - the men most likely to topple Nadal|
|French Open 2018: How can Rafael Nadal be stopped?|
|Steve Smith named as marquee player for Global T20 Canada|
|Can Emre play? Yes he Can... and so can Milner|
|Liverpool working to help fans after flight cancellations|
|Abbas and Hasan torment sorry England|
|Xavi ´thrilled´ to sign two-year Al Sadd extension|
|Holtby extends Hamburg contract despite relegation|
|Nadal begins French Open defence against Dolgopolov|
|Serena drawn to play Pliskova in French Open first round|
|FA condemns assault of match official|
|Bologna confirm Donadoni departure|
|Yates lead halved in Giro d´Italia|
|Connacht turn to Friend|
|Scotland lose injured Dunbar for June tour|
|Spalletti in ´no rush´ to sign new Inter deal|
|Ricciardo and Red Bull dominate Monaco practice|
|Mauricio Pochettino signs new deal with Tottenham|
|Pochettino signs new deal with Tottenham|
|Istanbul to host 2020 Champions League final|
|Williams sisters given French Open wildcard|
|President Donald Trump praises NFL´s anthem stance|
|Buffon in consideration for Italy call, says Mancini|
|Roberts injured in Broncos win against Eels|
|Atletico complete move for Villarreal star Rodri|
|Ozil, Gundogan not playing politics, says Low|
|Valencia complete permanent Kondogbia signing|
|Fairytale ending could be in the script, says World Cup-bound Vardy|
|Milwaukee police apologise to Bucks´ Brown over tasering|
|Television, crosswords and Nintendo - Koscielny´s remedy to World Cup heartache|
|World Cup not an audition for Barca or Madrid, says Germany star Werner|
|Neck injury rules Kohli out of Surrey stint|
|Nine LaLiga titles and 674 club games under nine managers - Iniesta in Opta numbers|
|49ers Enterprises takes stake in Leeds United|
|Manchester United should sell Pogba if he´s unhappy - Scholes|
|Andres Iniesta´s nine LaLiga triumphs with Barcelona|
|Andres Iniesta: The footballers´ footballer|
|Real Madrid v Liverpool: Salah has foundations in place for Ballon d´Or challenge|
|Iniesta´s Vissel Kobe move confirmed|
|Low upbeat over Neuer´s World Cup hopes|
|´No secrets´ in playoffs, says Celtics rookie Tatum|