Mitch Keller has been on a roll lately.
The right-hander has a 2.54 ERA in 28.1 innings over the last month. Those numbers coincide with Keller adding a new sinker to his arsenal, which has also brought a 52.5% ground ball rate in that span.
There are some concerns that Keller could regress from these results. His FIP is 3.70, and the xFIP is lower at 4.43. Keller has been trending up in each of his starts, and the last three indicate that if there is any regression, it would still leave Keller as a solid starter.