Just that one pitch? That seems weird. What would be the other explanations for a drop in spin rate on one pitch? Mechanics? It's not just the cutter but I focused on that since he throws that pitch more than all his other pitches combined. He's recorded the three lowest spin rates this season on his changeup, curveball, cutter, and sinker in his last three starts. The same would be true for his slider if not for his start on 5/19. However, his slider spin rate in that start is well below any of his other starts that it would almost seem to be an error.