What follows represents an attempt by the author to utilize the projections available at the site to identify the five starting pitchers whose per-inning WAR projections have most improved since the beginning of the season.
For every pitcher, what I’ve done is first to calculate his preseason (PRE) WAR projection prorated to 150 innings, averaging together Steamer and ZiPS forecasts where both are available. What I’ve done next is to calculate the prorated WAR for every pitcher’s rest-of-season (ROS) WAR projection (again, using both Steamer and ZiPS when available). I’ve then found the difference in prorated WAR between the preseason and rest-of-season projection.
When I attempted a similar exercise two months ago, I used updated end-of-season projections instead of prorated rest-of-season ones. The advantage of the latter (and why I used it on last month’s edition of this post, as well) is that it provides the closest available thing to an estimate of any given player’s current true-talent level — which, reason dictates, is what one requires to best identify those players who have most improved.
Only those pitchers have been considered who (a) are currently on a major-league roster and (b) have recorded at least 20 innings at the major-league level and (c) are expected to work predominantly as a starter for the duration of the season. Note that Projection denotes a composite Steamer and ZiPS projection. PRE denotes the player’s preseason projection; ROS, the rest-of-season projection. Inning estimates for both PRE and ROS projections are taken from relevant pitcher’s depth-chart innings projection. Data is current as of Tuesday.
5. Tom Koehler, RHP, Miami (Profile)
Projection (PRE): 154 IP, 6.4 K/9, 4.1 BB/9, 1.0 HR/9, 4.56 FIP, -0.1 WAR
Projection (ROS): 81 IP, 6.7 K/9, 4.1 BB/9, 1.0 HR/9, 4.53 FIP, 0.1 WAR
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