It's always hard to guess a 25 man roster for a single game 'series' especially in these days of more aggressive and adventurous pitching staff usage, but I will give it a shot.
Definite:
Sanchez, Romine (2)
Voit, Torres, Didi, Andujar (4)
Judge, Hicks, Stanton, McCutchen, Gardner (5)
Walker (1)
1 SP (Happ or Tanaka or Severino, I'm guessing Happ as of now) (1)
Betances, Britton, Robertson, Chapman, Green, Holder (6)
So that is 19, 6 to go. Add a second SP from the above group of three (I'll say Severino), Lynn, Hechavarria as a 3B defensive replacement, and that leaves three more relief spots, I will guess Loaisiga, Tarpley (a third lefty) and maybe Kahnle. Those last three seem wide wide open though, anyone who impresses this next week could jump in.
Definite:
Sanchez, Romine (2)
Voit, Torres, Didi, Andujar (4)
Judge, Hicks, Stanton, McCutchen, Gardner (5)
Walker (1)
1 SP (Happ or Tanaka or Severino, I'm guessing Happ as of now) (1)
Betances, Britton, Robertson, Chapman, Green, Holder (6)
So that is 19, 6 to go. Add a second SP from the above group of three (I'll say Severino), Lynn, Hechavarria as a 3B defensive replacement, and that leaves three more relief spots, I will guess Loaisiga, Tarpley (a third lefty) and maybe Kahnle. Those last three seem wide wide open though, anyone who impresses this next week could jump in.