Rosscup was designated for assignment by the Mariners on Friday.

Rosscup has posted a 3.21 ERA with 20 punchouts over 14 innings this season, but he'll head to the waiver wire after getting booted from the 40-man roster. Seattle also optioned Erik Swanson to Triple-A Tacoma, while Matt Festa was recalled and Ryan Garton's contract was purchased from the Rainiers.

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