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George Kirby Returns to Mariners' Rotation for Season Debut Against Astros

The All-Star pitcher, sidelined since March with shoulder inflammation, will start under a pitch limit as Seattle adjusts its roster to stabilize its rotation.

Sep 20, 2024; Arlington, Texas, USA; Seattle Mariners pitcher George Kirby (68) pitches against the Texas Rangers in the first inning at Globe Life Field. Mandatory Credit: Tim Heitman-Imagn Images/File Photo
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Overview

  • George Kirby is set to make his 2025 season debut Thursday night against the Houston Astros after recovering from shoulder inflammation.
  • The Mariners plan to limit Kirby to 75–80 pitches in his first start and maintain a six-day rotation schedule to prioritize his long-term health.
  • Kirby made three rehab starts at Triple-A Tacoma, with his most recent outing showing solid velocity and no walks despite allowing four runs.
  • Seattle has recalled right-hander Jesse Hahn and designated Casey Lawrence for assignment to address bullpen depth during Logan Gilbert's continued absence.
  • Kirby, an All-Star in 2023, is known for his elite control, including an MLB-leading 9.05 strikeout-to-walk ratio that year, and is expected to strengthen the Mariners' rotation as they lead the AL West.