I only have two closers on my team - Holland and Wilhelmsen who is in danger of losing, or at least getting a vaca from his current role.
Potential options out there would be:
FA's: Rex Brothers, JJ Putz
I could also potentially trade Johnson, Rendon, Rutledge, Murphy or Duda for one of the following:
Likely players I could trade for: Kenley Jensen, Chris Perez, Kevin Gregg
3b: Ramirez, Ar
OF: McCutchen, Adam Jones, Aoki, Cuddyer, Hunter Pence
UT: Arenado, David Murphy
Bench: Ramos, Rendon, Duda, Rutledge, Johnson, C
SP: Wainwright, Scherzer, Samardzija, Niese, Burnett, Maholm, Gee, Doubront, Gerrit Cole, Cingrani, Volquez, Wacha, Gausman
RP: Wilhelmsen / Holland
12 Team roto league standard categories with IP replacing K's. FA acquisitions limited to 10 pickups (3 remaining) all season.