Luis Castillo experienced discomfort in his left hamstring while evading a throw in the fourth inning of the game, prompting an MRI to assess the injury.
The Mariners may face severe playoff implications if Castillo's injury is serious, as their offensive struggles have been offset by their strong starting rotation.
Emerson Hancock is the leading candidate to step into the starter role if Castillo requires an injury list stint, but his consistency has been a concern.
With a 3.64 ERA over 175 1/3 innings, Castillo, despite not being at his 2023 best, remains a crucial asset to the Mariners' postseason push.
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