Miller throws a curveball, four-seam fastball, sinker, changeup and slider. He was limited to two games pitched in 2025. In 2023 — when Miller made 22 starts — he ranked in the 98th percentile for fastball velocity, 98th percentile for fastball run value, 95th percentile for pitching run value, 81st percentile for barrel percentage and 80th percentile for walk percentage.
