I'd say Siniakova and Kontaveit are the big faves here, with Konjuh and Sorribes Tormo coming close. I don't see Bencic or anyone else being good enough to be real contenders, but there are a few players out there who can pull some big upsets, but not win the whole thing.
Anyway, I'm eager to watch the development of this tourney, as many top players are peaking lately.
PS: if anyone's remembering me, I'm willing to come back on a daily basis here sometime in July, after I finish my exams and get my journalist license. I'm being nostalgic about this forum