Krol has been tinkering with his arsenal all season, and appears to have figured out a working formula.
Ian Krol has not been a good reliever for the Tigers over the last two seasons. In 2014, he had a 4.96 ERA and 1.68 WHIP in 32 2/3 major league innings. He allowed 11.6 hits per nine and posted a 5.18 FIP. This season, he has a 5.40 ERA and 1.69 WHIP in 26 2/3 innings. His hit rate has decreased to 10.1 hits per nine, and his 5.05 FIP is slightly better. The Tigers have demoted Krol to the minor leagues a total of five times over the last two seasons.