Tennis can be very strenuous if there are long rallies over and over. But the average point entails a few hard swings and some intense side-to-side movement. That is not as brutal as you are trying to make it sound.
You must not have played tennis competitively. When two good baselines are going at it, it is brutal... It requires explosive movements and oftentimes you have to stop yourself, change directions and yes, you get a few secs of break after each point but you have to go at the next point before you catch your breath! Tennis is physically demanding, wonder why so many injuries in tennis? The worst part about tennis is the changing of directions in explosive ways, this puts a lot of strain on your knees and hips. The other thing about tennis that wreaks havoc are the repetitive unnatural movements, to hit serves and fh's and bh's for hours is not natural for the body, it breaks down wrists, shoulders, elbows. Look at the back injuries for Fed, knee for Nadal, wrists for Del Po, hip for Andy, elbow and shoulder for Nole.
Why isn't Monfils the GOAT? Because of a number of mental and strategic reasons. I never said that athleticism was everything, so why are you arguing against a straw man argument?
Monfils is an athletic freak, i would compare him to any 6'4 basketball player you can name. Even so, he doesn't have much of an advantage physically vs Djokovic or Nadal on a tennis court. You seriously underestimate Djokovic and Nadal's athleticism, they are freaks. Again, your issue is that you don't play tennis competitively. As a guy that has played tennis competitively, i will tell you that athleticism is extremely important in tennis. I would say i'm average, with good strokes and a good serve. When i have played opponents that hit the ball less cleanly than me but are more athletic, it's a f challenge. They are able to run down more balls than me, they are able to use explosive movements to get to a ball and position themselves well, this is as important as actually having good technique and hitting ball cleanly. You seriously think Stephen Curry is more athletic than Djokovic or Nadal? What about Clay Thompson? these guys are some of the best basketball players around. Larry Bird was super athletic? I'm NOT arguing tennis players are more athletic, just that you underestimate the athleticism of some of the top tennis players and how tough tennis is to play, physically, at top level.
I simply said that calling the first set "brutal" is excessive on your part. There were some very strenuous rallies but I wouldn't call the set as a whole brutal.
that was brutal, for someone who actually plays tennis and knows tennis.