Roglic - GC favourite, without a doubt. Best top level, seems like he has a very nice team and hasn't rode the Tour.
Carapaz - the second biggest favourite. Was a decent amount better than Roglic in the mountains in the Giro, but its also easier to make big differences compared to the Vuelta where its slightly easier. On the other hand, there won't be as many kms against the clock. Paradoxically, I think the more explosive Vuelta stages suits Roglic more.
Lopez - third biggest favourite, disappointing Giro, but he is made for stage racing. If he can get on his 2017-level I think he has good chances of winning.
Valverde/Quintana - both have regressed, but both can STILL win. Movistar will keep them up in the GC and try to throw them at Jumbo like they did in the Giro.
Mas - really, really needs to show something this year and I think he will. Could also win, but unlikely (if he rides).
Kruijswijk - consistent as ever, but I just dont think he has the top level to deliver the goods. Could prove an incredible important luxury domestique.
Those are the guys that IMO can win the race this year, excluding Kruijswijk.
Simon Yates has ridden two GTs, so I just dont believe in him. Ineos has Thomas I guess, but he will prepare for the Worlds I heard. Hart and Poels can top-10. Guys like Pogacar, and Hiquita if selected, could be very interesting to follow.
As ever, the least anticipated GT by far, but I still love this race. Vamos Bala!