Nadal not going to chase number one like he said but he gets the chance to get it then he will of course hopefully by winning wtf title for the first time.
I just really struggle to see Rafa win the YEC. Not as long as it is played indoors, as it always is. He's got a few indoor titles. But to beat the best 8 players of the year indoors, especially when 2 of them are the best indoor players of all time, is always a stretch for him.
Plus now that Medvedev has had nearly 5 hours of play against him in addition to their first match in Toronto, if they get into the same round robin group, I'd expect Medvedev to beat him. Thiem on hard courts, is.... that one is probably a toss up. Assuming Thiem is healthy and even plays the YEC. I don't know about Tsitsipas indoors yet. No idea. If Zverev or Khachanov make it there, I'd pick either of them indoors over Rafa. No idea about Berrettini indoors. Rafa against Nishikori anywhere usually goes well for him. RBA doesn't need to do much to ensure his spot. So assuming he makes it, I'd probably take Rafa in that matchup. But he's definitely not the favorite to take any indoor title that Djokovic and Fed suit up at in my book.
I do however think he's got a great chance at number 1 because Djokovic is a good ways back and probably won't win enough to pass Rafa. Especially if he's not fully healthy and doesn't play both masters events and a 500 level.