Luis Castillo SP SEA Sun 3/29/20 9:21 PM
Luis Castillo
SP SEA
Castillo spent a portion of spring training working on improving his slider, C. Trent Rosecrans of The Athletic reports. Pitching coach Derek Johnson spoke of that work developing the slider: "There were some (strikeouts) on his slider, which I think has gotten better. I don't have the numbers in front of me on what he struck out guys with. Of course, the changeup is a weapon. I also think in time guys are going to start looking for his changeup more."