Casey Mize leaves Padres start with ankle sprain after slip on dugout steps; listed day-to-day

Right-hander Casey Mize is dealing with an ankle sprain after slipping down the dugout steps and being forced out of Saturday’s start for the San Diego Padres. The injury ended his outing early, and the team’s immediate timetable has him considered day-to-day as they evaluate what comes next. Imaging, according to reporting, came back clean, which is a meaningful distinction because it suggests there is no major structural damage.

The incident matters beyond the single game because Mize has been one of the more consequential additions for San Diego as it approached the recent trade deadline. In a season where rotations are typically asked to stretch through heavy workloads, a starting-pitcher injury can ripple quickly into bullpen usage, spot-start plans, and the order of matchups over the final weeks. For now, the Padres appear to be trying to keep his status fluid rather than immediately committing to a longer absence.

According to the report, Mize’s ankle injury occurred after he slipped on the dugout steps, and he exited during the start that was only his fourth appearance since the trade. That timing is important in understanding why the club’s near-term plan becomes less predictable: every start from a new arm can be a step toward establishing rhythm, command, and consistency, and losing a start interrupts that process.

The report also characterizes the sprain as day-to-day, which generally indicates a short-term evaluation window rather than an automatic multi-week stint on the injured list. Even so, baseball teams have to be careful with ankle injuries for pitchers because leg stability and stride mechanics are central to generating pace and repeating delivery. The Padres’ approach over the next several days is likely to revolve around how he feels during throwing progression and whether he can move normally without compensating.

For San Diego, this is occurring with late-season positioning still at stake and the pitching staff operating under constant pressure. When an anticipated rotation spot becomes uncertain, managers often tighten the bullpen’s early-game leverage roles and may push other starters to cover fewer or more innings than planned. While the report does not detail a replacement or a new start order, that would be the most practical next step for the club if Mize cannot go.

Padres fans will be watching two things in the immediate aftermath: whether Mize is able to resume throwing on schedule, and whether he can avoid turning a sprain into something more limiting. The “imaging came back clean” update helps, but the real test is functional, not diagnostic. If he truly remains day-to-day, San Diego could preserve the rest of its rotation plan with minimal disruption, but if the ankle stiffens or hurts through normal pitching work, the timetable can shift quickly.

Mize’s case is also a reminder of how quickly roster plans can change in baseball. A single slip in the dugout can force a pivot, even when a new acquisition is just beginning to settle in. For the Padres, the next on-field updates and any official injury status update will shape how aggressively they rearrange their pitching plans as the season moves toward its climax.