Mariners Claim Isaac Mattson off Waivers From Pirates
Seattle grabbed relief pitcher Isaac Mattson off waivers after Pittsburgh gave up on him. The right-hander had a strong 2025 season with a 2.45 ERA across 44 appearances, but struggled this year with injuries and inconsistency, finishing with a 5.35 ERA. The Mariners hope to help the veteran recapture his earlier form in their bullpen.
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