JMO but the Majors are actually easier on the top players then 1000's. They first week, they are just taking out the garbage because the field is so large. And they have a day off between rounds. Very very helpful, especially that Novak and Nadal are older now.
Like in Rome, on Friday Djokovic played a marathon match against Del Potro, on Saturday a 3 setter versus Schwartzmann and of course he would run out of gas vs Nadal in the final. He played 9 sets in less then 48 hours.
And he played 5 matches the week before.
None of that exist at the Slams. No wonder they make it to the Semis 90%+ percent of the time
It doesnt matter your age. It takes a toll on your body to play match after match after match with no rest in between days. Nadal was resting while Theim resumed his battle with the best player in the world just yesterday. It's too much.
Should have moved the final to tomorrow. Thiem would have got him.