Warren had n't been a rotation regular since his most recent full season in the minors in 2012 .
The plan to start Warren this season might have given fans pause , considering Warren 's 3.66 ERA in 53 Triple - A starts .
Warren had n't been a rotation regular since his most recent full season in the minors in 2012 , and the plan to start him this season might have given fans pause , considering his 3.66 ERA in 53 Triple - A starts .