I did a quick scan of top ERA SPs for 2012 and here is a list of those either pre-arbitration or in arbitration:
Pitcher, team, FA year
Chris Sale, CHW 2017
Jarrod Parker, OAK, 2018 (?)
Matt Harrison, TEX, 2015
Tommy Milone, OAK, 2018
Jason Hammel, BAL, 2014
Jeremy Hellickson, TB, 2017
Jordan Zimmermann, WAS, 2016
James McDonald, PIT, 2016
Wade Miley, WAS, 2018
Lance Lynn, STL, 2018
Vance Worley, PHI, 2018
Clayton Richard, SDG, 2015