I’ve been thinking about Wade Davis and Joe Kelly lately. Davis started 29 games in back to back seasons for the Rays in 2010 and 2011, striking out fewer than six batters per nine and putting up FIPs and xFIPs in the neighborhood of 4.70. The next season, the Rays moved Davis to the bullpen where he struck out more than 11 batters per nine and produced a 2.78 FIP. After trading for Davis that offseason, the Royals tried Davis at starter again for much of the 2013 season with poor results, and they’ve put him the bullpen ever since, where he’s again become dominant.
Davis and Kelly aren’t the same pitcher. Kelly throws much harder than Davis did as a starter and has a four-pitch repertoire that includes a change-up. However, both pitchers use a four-seamer, a slider or cutter, and a curveball and have most of their success with their fastballs. Meanwhile, Kelly shows similar and similarly underwhelming strikeout rates as Davis did as a starter. Kelly has had FIPs and xFIPs over 4.00 in each of his four seasons. That’s 461.2 innings of mediocre results, but the Red Sox seem to be planning to rely on Kelly as a starter again in 2016.
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