I know this thread was made out of boredom
But assuming injuries are non-existent and based on player's current forms.
I'll take a random stab. But of course my evaluation will change 1 week before these slams.
I think after this U.S. Open loss, he's going to come back hard, and attempt another run. Assuming he's consistent that is. I think Nadal will either lose in the tournament, or he will retire, I think his body will be down during this period, unless somehow it's injuryproof for another 10 months or so. I think Federer will make another close run, and probably lose to Djokovic in a rematch or in the finals.
I don't see anyone really defeating Nadal here.
I think Federer will defeat Nadal here. I think it will be another rematch.
He will be motivated after failing to win the first two.
I think Djokovic will take this. I liked his hard court game.
But, unfortunately, this thread will become a waste once those tournaments are about to start.
Because my favorites to win or place as runner up will change 100%, because we will witness injuries, inconsistencies, and other forms of feedback to tell us whose more probably to reach those spots.