Thiem must have the 8th seed.
Heres the scoop. The real threat is Cilic at this moment. Its a 218 seedings point gap, but points are basically doubled at this point for Cilic. Thiem has a full load of ATP 250/500 points as the title holder in six of these events. Thiem doesn't start to double really until he wins Halle; basically 50 of the 300 points for final is doubled. If Thiem makes Halle final (likely) and Cilic somehow beats Murray to make the other final. Vis a vis this seeding point gap from
@jm1980 's excellent spreadsheet (link below), Thiem picks up 305 more seeding points and Cilic picks up 465, but still narrowly behind Thiem. Cilic just making SF and Thiem losing QF is close too. Cilic nets 270 for the SF and Thiem only gains 45 points by making QF and Cilic nudges ahead by a scant 7 points. At this point Thiem has to match Cilic round to round and he's in, unless Steve Johnson's the man.
http://tt.tennis-warehouse.com/inde...seeds-djok-murray-fed-waw-will-be-1-4.565802/