Matt Brash threw a bullpen session, with live BP next for the Mariners reliever

Matt Brash threw a bullpen session and is expected to face live hitters in the coming days, per Ryan Divish. The Seattle Mariners reliever is advancing through his rehab program, with live batting practice representing the next step in his progression back from the injured list. Divish also reported that Bryan Woo is scheduled to throw a bullpen session, after which the Mariners plan to solidify their rotation plans for the upcoming Phillies series.

What happened

Divish reported that Brash completed a bullpen session and that live batting practice would follow in the coming days. No specific date for the live BP was provided, and the report did not include the nature of Brash's injury, which injured list he is currently on, or when he was placed there.

The timing of Brash's progression coincides with Woo's own bullpen session. Divish indicated that the Mariners intend to finalize their rotation plans for the Phillies series after Woo throws, suggesting the club is managing multiple pitchers through various stages of readiness as the season enters its final stretch.

Why it matters

Live batting practice is one of the later checkpoints in a pitcher's return from the injured list. Completing a bullpen session and advancing to live BP typically means a pitcher has cleared the early stages of his rehab program and is approaching the point where the club must decide whether he needs a minor-league rehab assignment or can be activated directly to the major-league roster.

Under general league mechanics, pitchers are eligible for up to 30 days of minor-league rehab before a club must activate them or make another roster decision. Whether Brash would require that kind of extended work, or could return more directly, depends on details — the length of his absence, the nature of his injury — that the report did not include.

What the report does make clear is that Brash is moving forward. For a Mariners bullpen navigating the final weeks of a season in which the Wild Card arithmetic is already demanding, that directional news carries weight even without a firm timetable attached to it. The Phillies series that Divish flagged as the rotation planning target is also one of the more significant remaining matchups: Zack Wheeler is among the more formidable starters Seattle will face down the stretch, and having clarity on the rotation before that series begins matters when margins are this thin.

The numbers

Seattle enters Saturday at 67-77 (.465), sitting third in the AL West and 6 games back in the division. In the Wild Card race, the Mariners rank eighth, sitting 6.0 games behind the cut line. They carry a one-game winning streak into the weekend.

Where the club stands

The club hosts the Chicago Cubs at T-Mobile Park on Saturday and Sunday, with Kade Anderson scheduled opposite David Peterson on Saturday and Bryce Miller set to face Shota Imanaga on Sunday. The Philadelphia Phillies then arrive Monday, with Logan Gilbert drawing the start against Zack Wheeler.

That Phillies series is the one Divish specifically flagged as the rotation planning target — the club intending to finalize those plans after Woo's bullpen session. It is a reasonable place to draw a line: having clarity on the rotation before that series begins is the kind of operational detail that matters when the margin for error is as thin as 6.0 Wild Card games.

What we don't know yet

The report did not specify which injured list Brash is on, the injury that placed him there, or when he was placed on it. Those details would help clarify how much runway remains in his rehab program and whether a minor-league assignment is likely before any activation.

No date was given for the live batting practice session beyond "a few days." The Mariners have not announced how Brash's return would affect the current bullpen configuration, or what corresponding roster move, if any, would accompany his activation when the time comes.

The rotation picture around Woo also remains unsettled, per Divish, pending the outcome of his bullpen session. How both situations resolve will shape Seattle's pitching plans heading into the Phillies series and beyond.

What to watch

The live batting practice session is the immediate next checkpoint. How Brash responds to facing hitters will tell the Mariners whether he is ready to advance toward activation or needs additional work. A clean live BP would move the conversation from "is he progressing?" to "how soon, and through what path?"

Woo's bullpen session is the parallel thread. Divish reported that the club's rotation plans for the Phillies series hinge on that session, which means the next few days could bring clarity on two fronts simultaneously — the bullpen's depth and the rotation's shape for one of the more consequential series remaining on the schedule.

From September 1 onward, rosters expand under general league rules, which can ease some of the roster math around returning players. Whether Brash's timeline aligns with that window is one of the open questions worth tracking as the live BP approaches.

The Mariners are in a position where every healthy arm matters. A 6.0-game Wild Card deficit is not insurmountable, but it is not forgiving either, and the club's ability to deploy a full complement of reliable relievers in late-game situations will be part of whatever case Seattle makes over the final weeks. Brash's bullpen session is one data point in that larger picture — a promising one, per Divish, but still a step removed from a return date.