With yesterday's early withdrawals of Jack Sock and Denis Istomin, the number of players to retire early during this year's US Open has risen to an alarming 14 - equaling the Grand Slam record after only two rounds.
Related - Denis Istomin becomes record 12th man to withdraw from 2015 US Open
Speaking to reporters following his one-sided defeat of Belgian Steve Darcis Thursday evening, Federer gave his two cents on the much-discussed matter.
"It was more on the warmer side, but it's not impossible, to be honest."
Even with temperatures of 33C, the five-time US Open champ thinks players should be fit enough to overcome the conditions, regardless of how challenging they may be.
"I know we don't play many best-of-five-set matches all the time, so of course the body can react funny once you exceed the two-and-a-half to three-and-a-half hours of play."
Federer continued, "I think you have to analyze case by case. But I think other players should be so fit that heat really shouldn't matter at that point."
The 34-year-old 17-time Grand Slam champ will be hoping to continue his brilliant run of form against 29th seeded Philipp Kohlschreiber Saturday evening.