王建民
Detwiler was named to the starting rotation for the 2012 season. Although he pitched effectively, the return of Chien-Ming Wang from injury put Detwiler in the long relief role in late May. Wang struggled in the rotation, granting Detwiler a return to the rotation a few weeks later. He was a regular starter for the rest of the year, finishing with 27 starts, plus a six-inning start, in which he allowed one unearned run, in game 4 of the 2012 NLDS.